8 Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
[AD 215] Clement of Alexandria on Philippians 4:8
They maintain that one should gratify the lusts and passions, teaching that one must turn from sobriety to be incontinent. They set their hope on their private parts. Thus they shut themselves out of God's kingdom and deprive themselves of enrolment as disciples, and under the name of knowledge, falsely so called, they have taken the road to outer darkness. "For the rest, brethren, whatever is true, whatever is holy, whatever is righteous, whatever is pure, whatever is attractive, whatever is well spoken of, whatever is virtuous, and whatever is praiseworthy, think on these things. And whatever you have learnt and received and heard and seen in me, this do. And the God of peace shall be with you."

[AD 370] Gaius Marius Victorinus on Philippians 4:8
“Whatever is true”—What are these true things? They are set out in the gospel: Jesus Christ is the Son of God and all that goes with that good news. When your thoughts are true, it follows that they will be honorable. What is true is not corrupted, which means that it is honorable. What is not corrupted is true. Then what is true and honorable will also be just, for it is made just or justified. And what is made just is pure since it receives sanctification from God. All that is just, honorable, true and pure is lovable and also gracious. For who does not love these saintly virtues? Who does not speak and think well of them?… Of this list some items pertain to true virtue in itself, while the later ones pertain to the fruit of virtue. To virtue it belongs to love truth, honor, justice and purity. To the fruit of virtue belongs that which is lovely and gracious.

[AD 370] Gaius Marius Victorinus on Philippians 4:8
In saying “if there be any excellence, any praise,” he takes good note of the nature of things. For all things happen by the grace of God, who governs and rules through the Spirit that he sends into us. We count on nothing of our own, but on grace alone. This is why he speaks conditionally: “if any excellence,” for the virtues being nurtured in us are not from us but from God’s grace. So not even the praise is ours. Therefore he also says “if there is anything worthy of praise.”

[AD 407] John Chrysostom on Philippians 4:8
"Finally, brethren, whatsoever things are honorable, whatsoever things are true, whatsoever things are just." What is "Finally"? It stands for, "I have said all." It is not the word of one that is in haste, and has everything to do with present things. "Finally, brethren, whatsoever things are honorable, whatsoever things are true, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report, if there be any virtue, and if there be any praise, think on these things."

What meaneth, "whatsoever things are lovely"? Lovely to the faithful, lovely to God. "Whatsoever things are true." Virtue is really true, vice is falsehood. For the pleasure of it is a falsehood, and its glory is falsehood, and all things of the world are falsehood. "Whatsoever things are pure." This is opposed to the words "who mind earthly things." "Whatsoever things are honorable." This is opposed to the words "whose god is their belly." "Whatsoever things are just," i.e. saith he, "whatsoever things are of good report." "If there be any virtue, if there be any praise." Here he willeth them to take thought of those things too which regard men. "Think on these things," saith he. Seest thou, that he desires to banish every evil thought from our souls; for evil actions spring from thoughts.

"Whatsoever things are true," for the things we have been speaking of are false. "Whatsoever things are honorable." That which is "honorable" belongs to external virtue, that which is "pure" to the soul. Give no cause of stumbling, saith he, nor handle of accusation. Because he had said, "Whatsoever things are of good report," lest you should think that he means only those things which are so in the sight of men, he proceeds, "if there be any virtue, and if there be any praise, think on these things"-do these things. He wills us ever to be in these things, to care for these things, to think on these things. For if we will be at peace with each other, God too will be with us, but if we raise up war, the God of peace will not be with us. For nothing is so hostile to the soul as vice. That is, peace and virtue place it in safety. Wherefore we must make a beginning on our part, and then we shall draw God toward us.