Charles Ellicott Commentary Romans 2:1

"Wherefore thou art without excuse, O man, whosoever thou art that judgest: for wherein thou judges another, thou condemnest thyself; for thou that judgest dost practise the same things." — Romans 2:1 (ASV)

Therefore.—The description just given of the state of one section of the human race contains implicitly the condemnation of the other; for it is equally applicable to both.

Wherein thou judgest another.—By the very act of sitting in judgment upon your fellow-man, you pass sentence upon yourself. You declare those acts to be criminal of which you yourself are guilty.

The words in the Greek, translated by “judge” and “condemn,” are related to each other much the same as the summing up of a judge is related to his verdict. In the first, sentence is in process of being passed, but there is still a possibility of acquittal; in the second, sentence has been definitively given in a sense adverse to the accused. “Another,” rather, strictly, the other, your fellow, or neighbour.