William Burkitt on 1 Corinthians 4:3

Not as if the apostle was unconcerned whether the Corinthians had a good esteem of him, or not; or were regardless of his reputation among men: but the meaning is, he did not much value himself upon the opinion and judgment which any persons had of him, knowing that his case would not be finally determines by any man's judgment, nor yet by his own.

Therefore, says he, I judge not myself; that is, definitively, so as to acquiesce in that judgment: for I may be deceived in my judgment of myself, therefore I leave myself to the judgment of God. It is a singular support to all the members, but especially the ministers of Jesus Christ, that they and their actions have a more righteous judge to be examined and tried by, than either the world or themselves; the world's judgment may falsely condemn them, their own judgment may flatter and deceive them, but the judgment of God will deal impartially with them.