Righteousness

"To come to such a hearty approval of Christ's righteousness we need first of all to be aware that we need a righteousness with which to appear before God. If God is holy and righteous and of purer eyes than to look at iniquity, we must have a righteousness with which we are able to stand before him.
We will only approve of Christ's righteousness when we are convinced that our righteousness has been weighed in the balances and found wanting. The Jews made the mistake of trutstin gin their own righteousness (Rom. 9:31,32). And so they were rejected (Rom. 10:1-4). (See Paul's judgment of man's righteousness in Phil. 3:8-10). God declares that 'there is none righteous, no not one'. Isaiah declares that 'our righteousnesses are like filthy rags' (Isa. 64:6).
He who has fellowship with Christ approves of, values and rejoices in his righteousness by which he is accepted by God (Isa. 45:24). This is the pearl of great price (Matt. 13:45,46)."

-John Owen, Communion With God, Pg. 141