John Chrysostom
"And be found in Him, not having my own righteousness, which is from the law." If one who had righteousness from the law fled to the righteousness of Christ because the former means nothing, how much more must those flee to Christ who do not have it?
He said well, "not having my own righteousness." That is, he says, not the righteousness that I acquired afterward and by labors, but the one I received by grace. Therefore, if even the virtuous man is saved by grace, much more are you.
The Philippians were likely saying that righteousness acquired by labors is more important. Therefore the Apostle shows that such righteousness is refuse before that other righteousness. If I had ever accomplished it, I would not have rejected it and fled to the other.
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What righteousness is this? It is the righteousness that comes from faith in God, that is, the righteousness given by God. This is the righteousness of God. It is wholly God's gift.
God's gift is far superior to small good works performed by our own effort.
And what is faith? "By faith," he says, "that I may know Him" (Phil 3:10). Therefore knowledge of God is acquired by faith, and without faith it is impossible to know Him.
How so? One must know the power of His resurrection by faith. What reasoning, indeed, will persuade us of the resurrection? None, but faith alone.
If Christ's resurrection in the flesh is known by faith, then by what reasonings can the birth of God the Word be comprehended? For the resurrection is less than the birth. Why? Because there were many examples of resurrection, but not one example of such a birth.
Before Christ, many dead had risen, though after rising they died again. But no one had ever been born of a virgin. Therefore, if what is less than the birth according to the flesh must be grasped by faith, how can what is far greater, infinitely and incomparably greater, be grasped by reasoning?
This is what constitutes righteousness. One must believe that this could be, but how it could be is impossible to imagine.
Communion in the sufferings also depends on faith. How? If we did not believe, we would not suffer. If we did not believe that by suffering with Christ we shall also reign with Him, we would not endure sufferings.
Therefore both the birth and the resurrection are grasped by faith. Do you see that faith is needed not simply, but faith joined to works?
The one who especially believes that Christ has risen is he who boldly goes into dangers. He has communion in His sufferings, because he has communion with the risen One, with Him who lives.
For this reason the Apostle said, "And be found in Him, not having my own righteousness, which is from the law, but that which is through faith in Christ, the righteousness from God by faith; that I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death, if somehow I may attain the resurrection of the dead" (Phil 3:9-11).