Does not God then do injustice to man, by requiring from him in his law, that which he cannot perform?

Not at all; (a) for God made man capable of performing it; but man, by the instigation of the devil, (b) and his own wilful disobedience, (c) deprived himself and all his posterity of those divine gifts.

(a) Eph.4:24 And that ye put on the new man, which after God is created in righteousness and true holiness. Eccl.7:29 Lo, this only have I found, that God hath made man upright; but they have sought out many inventions. (b) John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it. 2 Cor.11:3 But I fear, lest by any means, as the serpent beguiled Eve through his subtilty, so your minds should be corrupted from the simplicity that is in Christ. Gen.3:4 And the serpent said unto the woman, Ye shall not surely die: (c) Gen.3:6 And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat. Rom.5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: Gen.3:13 And the LORD God said unto the woman, What is this that thou hast done? And the woman said, The serpent beguiled me, and I did eat. 1 Tim.2:13 For Adam was first formed, then Eve. 1 Tim.2:14 And Adam was not deceived, but the woman being deceived was in the transgression.