I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.

I am the Lord who search the heart and prove the reins: who give to every one according to his way, and according to the fruit of his devices.

I Jehovah search the heart, I try the reins, even to give each one according to his ways, according to the fruit of his doings.

I Jehovah do search the heart, try the reins, Even to give to each according to his way, According to the fruit of his doings.

I the Lord am the searcher of the heart, the tester of the thoughts, so that I may give to every man the reward of his ways, in keeping with the fruit of his doings.

I am the Lord, who examines the heart and tests the temperament, who gives to each one according to his way and according to the fruit of his own decisions.

Ego Jehova exquirens (vel, explorans) cor, examinans renes, ad dandum (id est, ut dem, ut reddam) cuique secundum vias ejus, secundum fructum operum ejus.

The answer to the question, "who can know it?" To himself a man's heart is an inscrutable mystery: God alone can fathom it.
Ways - Rather, way, his course of life. The "and" must be omitted, for the last clause explains what is meant "by man's way," when he comes before God for judgment. It is "the fruit," the final result "of his doings, i. e., his real character as formed by the acts and habits of his life.

I the Lord search the heart - The Lord is called by his apostles, Acts 1:24, Καρδιογνωστης, the Knower of the heart. To him alone can this epithet be applied; and it is from him alone that we can derive that instruction by which we can in any measure know ourselves.

I the Lord search the heart,.... The inward parts of it, every room and corner in it; and know the thoughts of it; all its intents, purposes, designs, contrivances, and imaginations; all the secret motions of it, and the wickedness that is in it; so that this is an answer to the question in the preceding verse; and therefore, though the heart is deceitful, it cannot deceive him, because he judges not according to outward appearance; he sees and knows the heart; and none but the Lord, or he who is Jehovah, can so search the heart as thus to know it; wherefore, since Christ is said to search the reins and the heart, and to know the thoughts of men, and to be a discerner of the thoughts and intents of the heart, he must be Jehovah, and the true God, Revelation 2:23,
I try the reins; the most inward and remote parts, covered with fat, and out of sight: these are the seat of the affections; and the Lord tries these, whether they are towards him or not; and whether sincere or hypocritical; Christ the omniscient God knew Peter's love to him, and the sincerity of it; for which he appeals to him as such, John 21:17,
even to give every man accordions to his ways, and according to the fruit of his doings; to do which it is necessary to search the heart, and try the reins, the fountain of all actions; and in which the principles of them are, and according to which they are denominated and judged of: in the future judgment every secret thing will be brought into account; the counsels of the heart will be made manifest; the book of conscience will be opened; and out of it, as well as other books, men will be judged according to their ways and works; and therefore it is requisite that the Judge should be the Lord God omniscient, the searcher and trier of the hearts and reins, as Christ is.

Lest any should infer from Jeremiah 17:9, "who can know it?" that even the Lord does not know, and therefore cannot punish, the hidden treachery of the heart, He says, "I the Lord search the heart," &c. (1-Chronicles 28:9; Psalm 7:9; Proverbs 17:3; Revelation 2:23).
even to give--and that in order that I may give (Jeremiah 32:19).