The Apostle Paul
Philippians 2:15ESV·traditional attribution

that you may be blameless and innocent, children of God without blemish in the midst of a crooked and twisted generation, among whom you shine as lights in the world,

John Calvin Reformed @genevareformer

15 The sons of God, unreprovable. It ought to be rendered — unreprovable, because ye are the sons of God. For God’s adoption of us ought to be a motive to a blameless life, that we may in some degree resemble our Father.

Matthew Henry Presbyterian @wholebiblehenry

The apostle exhorts them in these verses to adorn their Christian profession by a suitable temper and behaviour, in several instances. 1. By a cheerful obedience to the commands of God (Phi 2:14): "Do all things, do your duty in every branch of it, without murmurings. Do it, and do not find fault with it.

Commenting on Philippians 2:14-18

John Gill Reformed Baptist @doctorgill

That ye may be blameless,.... This, and what follows, show the end to be answered, by observing the above exhortation. This respects not their being blameless in the sight of God, which the saints are not in themselves, being not without sin, though they are, as considered in Christ, clothed with his righteousness, and washed in his blood; but their being blameless before men: and...