But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them;

But abide thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them.

But continue thou in those things which thou hast learned, and which have been committed to thee: knowing of whom thou hast learned them;

And thou, be remaining in the things which thou didst learn and wast entrusted with, having known from whom thou didst learn,

But you must cling to the things which you have learnt and have been taught to believe, knowing who your teachers were,

But see that you keep to the teaching you have been given and the things of which you are certain, conscious of who has been your teacher;

Yet truly, you should remain in those things which you have learned and which have been entrusted to you. For you know from whom you have learned them.

You, however, must stand by what you learnt and accepted as true. You know who they were from whom you learnt it;

But as for thee, continue in those things which thou hast learned Although wickedness prevail, and push its way forward, he advises Timothy nevertheless to stand firm. And undoubtedly this is the actual trial of faith, when we offer unwearied resistance to all the contrivances of Satan, and do not alter our course for every wind that blows, but remain steadfast on the truth of God, as on a sure anchor. Knowing from whom thou hast learned them This is said for the purpose of commending the certainty of the doctrine; for, if any one has been wrong instructed, he ought not to persevere in it. On the contrary, we ought to unlearn all that we have learned apart from Christ, if we wish to be his disciples; as, for example, it is the commencement of our pure instruction in the faith to reject and forget all the instruction of Popery. The Apostle therefore does not enjoin Timothy to defend indiscriminately the doctrine which has been delivered to him, but only that which he knows to be truth; by which he means, that he must make a selection. [1] Besides, he does not claim this as a private individual, that what he has taught shall be reckoned to be a divine revelation; but he boldly asserts his own authority to Timothy, who, he was aware, knew that his fidelity and his calling had been proved. And if he was fully convinced that he had been taught by an Apostle of Christ, he concluded that therefore it was not a doctrine of man, but of Christ. This passage teaches us, that we ought to be as careful to guard against obstinacy in matters that are uncertain, (such as all the doctrines of men are,) as to hold within unshaken firmness the truth of God. Besides, we learn from it, that faith ought to be accompanied by prudence, that it may distinguish between the word of God and the word of men, so that we may not adopt at random everything that is brought forward. Nothing is more inconsistent with the nature of faith than light credulity, which allows us to embrace everything indiscriminately, whatever it may be, and from whomsoever it proceeds; because it is the chief foundation of faith, to know that it has God for its author. And which have been intrusted to thee [2] When he adds, that the doctrine had been intrusted to Timothy, this gives (auxesin) additional force to the exhortation; for to "commit a thing in trust" is something more than merely to deliver it. Now Timothy had not been taught as one of the common people, but in order that he might faithfully deliver into the hands of others what he had received.

Footnotes

1 - "Par lequel mot il signifie qu'il est requis d'user de jugement et discretion en cest endroit." -- "By this word, he means that it is necessary to use judgment and discretion in that matter."

2 - "Et qui to vent commises ou desquelles plene assurance t'a este donnee." -- "And which have been intrusted to thee, or of which full assurance hath been given to thee."

But continue thou in the things which thou hast learned and hast been assured of - To wit, the truths of religion. Timothy had been taught those truths when a child, and he had been confirmed in them by the instructions of Paul. Amidst the errors and seductions of false teachers, Paul now exhorts him to hold fast those doctrines, whoever might oppose them, or whatever might be the consequence; compare the notes at 2-Timothy 1:13.
Knowing of whom thou hast learned them - To wit, of his mother 2-Timothy 1:5, and of Paul; 2-Timothy 1:13. The reference seems to be particularly to the fact that he had learned these truths first from the lips of a mother (see 2-Timothy 3:15); and the doctrine taught here is, "that the fact that we have received the views of truth from a parent's lips, is a strong motive for adhering to them." It is not to be supposed, indeed, that this is the highest motive, or that we are always to adhere to the doctrines which have been taught us, if, on maturer examination, we are convinced they are erroneous; but that this is a strong reason for adhering to what we have been taught in early life. It is so, because:
(1) a parent has no motive for deceiving a child, and it cannot be supposed that he would teach him what he knew to be false;
(2) a parent usually has had much more experience, and much better opportunities of examining what is true, than his child has;
(3) there is a degree of respect which nature teaches us to be due to the sentiments of a parent.
A child should depart very slowly from the opinions held by a father or mother; and, when it is done, it should be only as the result of prolonged examination and prayer. These considerations should have the greater weight, if a parent has been eminent for piety, and especially if that parent has been removed to heaven. A child, standing by the grave of a pious father or mother, should reflect and pray much, before he deliberately adopts opinions which he knows that father or mother would regard as wrong.

But continue thou - No man, however well instructed in the things of God, or grounded in Divine grace, is out of the reach of temptation, apostasy, and final ruin; hence the necessity of watching unto prayer, depending upon God, continuing in the faith, and persevering unto the end.

But continue thou in the things,.... That is, in the doctrines of the Gospel, and not be moved away from them, either through the malice or persecutions, or the cunning sleight of men that lie in wait to deceive; and which is an exhortation suitable to the godly in all ages: and what follow are so many reasons enforcing it:
which thou hast learned: not merely in a theoretical way, as arts and sciences are learned, but in a spiritual and experimental manner; a comfortable knowledge and experience of which he had attained unto; and were not like those in 2-Timothy 3:7, who had been ever learning, and yet could not come to the knowledge of the truth: and since therefore he had learned the truths of the Gospel, and had attained to a good understanding of them, it was his duty, as it is the duty of all such, to abide by them:
and hast been assured of: the doctrines of the Gospel are certain things; they are truths without controversy; there is a full assurance of understanding of them, which men may arrive unto, and which ministers should, since they are to affirm them with certainty. Scepticism is very unbecoming one that calls himself a minister of the Gospel; and when a man is assured of the truth and reality of Gospel doctrines, it would be shameful in him to drop them, or depart from them:
knowing of whom thou hast learned them. The apostle means himself, though he modestly forbears the mention of himself: and it is another argument why Timothy should continue steadfastly in the doctrines of the Gospel, seeing he had learned them of so great an apostle of Christ; whose mission, as such, was abundantly confirmed by miracles and success, and who had received these doctrines by immediate revelation from Christ; so that it was all one as if Timothy had learned them from Christ himself. The Alexandrian copy reads the word "whom", in the plural number, as if the apostle referred to more teachers of Timothy than himself; however, he doubtless was the principal one.

Those who would learn the things of God, and be assured of them, must know the Holy Scriptures, for they are the Divine revelation. The age of children is the age to learn; and those who would get true learning, must get it out of the Scriptures. They must not lie by us neglected, seldom or never looked into. The Bible is a sure guide to eternal life. The prophets and apostles did not speak from themselves, but delivered what they received of God, 2-Peter 1:21. It is profitable for all purposes of the Christian life. It is of use to all, for all need to be taught, corrected, and reproved. There is something in the Scriptures suitable for every case. Oh that we may love our Bibles more, and keep closer to them! then shall we find benefit, and at last gain the happiness therein promised by faith in our Lord Jesus Christ, who is the main subject of both Testaments. We best oppose error by promoting a solid knowledge of the word of truth; and the greatest kindness we can do to children, is to make them early to know the Bible.

But . . . thou--Whatever they may do. Resuming the thread begun at 2-Timothy 3:10.
learned--from me and thy mother and grandmother (2-Timothy 1:5; 2-Timothy 2:2).
assured of--from Scripture (2-Timothy 3:15).
of whom--plural, not singular, in the oldest manuscripts, "from what teachers." Not only from me, but from Lois and Eunice.

Continue thou. Refusing to heed the evil men, continue in the truth.
Knowing of whom thou hast learned them. Of pious parents first, but more especially of Paul.
And that from a child. Taught by his grandmother, Lois, and his mother, Eunice, he had learned to know the Scriptures from childhood.
Holy Scriptures. The Books given by inspiration. The Jewish Scriptures are primarily meant, but a part of the New Testament was already written.
Make thee wise. Give thee the wisdom that leads to salvation. If the Old Testament could make him wise, how much more the New!
Through faith which is in Christ Jesus. This is essential. Unless the Scriptures lead to Christ, there is no salvation.
All Scripture. The Revision is much better. "Every Scripture inspired of God is also profitable," etc. Whether it is, depends on its inspiration. For instance, the Apocrypha is called Scripture, but is not inspired.
For doctrine. For teaching.
That the man of God. The preacher. See 1-Timothy 6:11; 1-Kings 13:1; 2-Kings 6:6.
May be perfect. Fully fitted for his work. The sense is "complete."
Thoroughly furnished. Fully equipped. If he is master of the Holy Scriptures, he is so equipped. If this was true when Paul wrote, with only a part of the New Testament written, with what emphasis may it be said now when we have both the Old and New Testaments in full!

From whom - Even from me a teacher approved of God.