He speaks as if saying: therefore, those of you who already consider yourselves perfect, let us change our opinion of ourselves and begin to think as I have set forth.
He included himself among those being instructed in order to soften the rebuke and the corrective exhortation.
Or the word "perfect" is taken by him not absolutely, but relatively: those who are more perfect than others.
In a community of persons, all are never on one line. Some are always better, others worse, and some very good, standing out among the rest.
To these the Apostle says: you who are better than others, do not admit the thought that you have already reached the end.
Think as I do: that you have not yet attained and have not yet been made perfect. Forget what lies behind, and strive ever forward and forward.
Or he calls perfect those who strive toward perfection and are zealous to attain it.
It is as if he says: you who strive toward perfection, if you wish to attain it, never think that you have attained it. Rather, keep pressing on and on after it, and you will attain.
This is the sign that someone strives toward perfection and has attained it in some measure: he considers himself imperfect.
At the first steps on the path to perfection, someone may still think that he is perfect.
But after he has gone a little way, he will surely see that the path is long. The more and faster he goes, the farther and farther the final limit appears.
The Apostle expresses, as it were: however perfect we may be, let us think this way.
There is no point in applying perfection to oneself, when this is the law: those being perfected see themselves more and more as less perfect.
Chrysostom says that "this is perfection: not to consider oneself perfect. What is 'this'? That what lies behind must be forgotten.
Therefore the property of the perfect man is not to consider himself perfect. This constitutes perfection."
"And if in anything you think otherwise, God will reveal even this to you." This is somewhat obscure.
The more direct thought seems to be this: if you reason otherwise about this, I am confident that God will reveal to you that you judge wrongly.
He will lead you to the way of thinking I have set forth: He will reveal even this.
One may supply: I pray that He reveal it. Or: pray, and God will reveal it. Or simply: may the Lord reveal this also to you.
The Apostle had to say: if you judge otherwise, be instructed. But he gave the speech such a turn that he arouses in them the desire for instruction.
Chrysostom says: "'If you think otherwise,' that is, if anyone thinks he has accomplished all the virtues.
The Apostle warns the Philippians, but he did not speak in that way. What did he say? 'God will reveal even this to you.'
See how modestly he said this. God will teach you. For though Paul teaches, God gives understanding.
However, the Apostle did not say, 'He will give understanding,' but, 'He will reveal,' in order to show that such an opinion comes chiefly from ignorance.
This was said not about dogmas, but about perfection of life and about not considering oneself perfect.
For whoever thinks of himself that he has already attained everything has nothing."