Have you understood all these things? We must keep in recollection what we have formerly seen, that all the parables of Christ were explained in private. And now the Lord, after having taught them in this kind and familiar manner, warns them at the same time, that his object, in taking so much pains to instruct them, was not merely that they might be well informed, [1] but that they might communicate to others what they had received. In this way he whets and excites their minds more and more to desire instruction. He says that teachers are like householders, who are not only careful about their own food, but have a store laid up for the nourishment of others; and who do not live at ease as to the passing day, but make provision for a future and distant period. The meaning, therefore, is, that the teachers of the Church ought to be prepared by long study for giving to the people, as out of a storehouse, [2] a variety of instruction concerning the word of God, as the necessity of the case may require. Many of the ancient expositors understand by things new and old the Law and the Gospel; but this appears to me to be forced. I understand them simply to mean a varied and manifold distribution, wisely and properly adapted to the capacity of every individual.

Footnotes

1 - "Qu'ils gardent ceste cognoissance pour eux-mesmes seulement;" -- "that they may keep that knowledge for themselves only."

2 - "Commoe nous voyons que le pere de famille tire de son cellier ou grenier toutes sortes de provisions;" -- "as we see that the master of a family draws from his cellar or granary all kinds of provisions."

Jesus kindly asked them whether they had understood these things. If not, he was still willing to teach them. He enjoined on them their duty to make a proper use of this knowledge by speaking another parable.
Every scribe which is instructed unto the kingdom of heaven - That is, every man that is acquainted with the gospel or with the truth. As the disciples had said that they had understood the truth, he says that it should not be unemployed. They should bring it forth in due time, like a householder bringing out of his treasury, or place of deposit, what had been laid up there at any time, as it was needed.
Bringeth forth - As occasion demands; as sickness, or calamity, or the wants of his family, or the poor require.
Treasure - The word "treasure" here means a place of deposit, not for money merely, but for anything necessary for the comfort of a family. It is the same as "treasury" or a place of "deposit."
New and old - Things lately acquired, or things that had been laid up for a long time. So, said Christ, you, my disciples, are to be. The truth, new or old, which you have gained, keep it not laid up and hid, but bring it forth, in due season and on proper occasions, to benefit others. Every preacher should be properly instructed. Christ for three years gave instructions to the apostles; and they who preach should be able to understand the gospel, to defend it, and to communicate it to others. Human learning alone is indeed of no value to a minister; but all learning that will enable a man better to understand the Bible and communicate its truths is valuable, and should, if possible, be gained. A minister should be like the father of a family - distributing to the church as it needs; and out of his treasures bringing forth truth to confirm the feeble, to enlighten the ignorant, and to recover and guide those who are in danger of straying away.

Have ye understood all these things? - Divine truths must not be lightly passed over. - Our Lord's question here shows them to be matters of the utmost weight and importance; and that they should be considered again and again, till they be thoroughly understood.

(9) Jesus saith unto them, Have ye understood all these things? They say unto him, Yea, Lord.
(9) They ought to be diligent, who have to be wise not only for themselves, but who have to dispense the wisdom of God to others.

Jesus saith unto them,.... This is left out in the Vulgate Latin, and Ethiopic versions, and in Munster's Hebrew Gospel, and in some Greek exemplars; though it is necessary to the connection and sense of the words:
have ye understood all these things? All the parables Christ had delivered, besides those he had given a particular explanation of; as of the mustard seed, and leaven, of the treasure hid in the field, the pearl of great price, and the net cast into the sea: Christ's putting this question to the disciples, shows that the things delivered, had some difficulty in them; that they were of moment and importance to be understood; and how concerned he was, that they should understand them; and how ready he was to communicate the knowledge of them, which he knew would be useful to them in their after ministrations:
they say unto him, yea, Lord. This answer, which was truly and faithfully made, is a proof of their close and strict attention to the words of Christ; the quickness of their understandings, at that time, being in a very special manner opened and illuminated by Christ; and which he knew, when he put the question to them; but was willing to have it owned and expressed by themselves, that he might have the opportunity of saying what follows.

Jesus saith unto them--that is, to the Twelve. He had spoken the first four in the hearing of the mixed multitude: the last three He reserved till, on the dismissal of the mixed audience, He and the Twelve were alone (Matthew 13:36, &c.).
Have ye understood all these things? They say unto him, Yea, Lord.

Every scribe instructed unto the kingdom. Such will be able to furnish rich and suitable spiritual food. Scribes were theological teachers.