The Apostle Paul
Philippians 3:7ESV·traditional attribution

But whatever gain I had, I counted as loss for the sake of Christ.

John Calvin Reformed @genevareformer

7. What things were gain to me He says, that those things were gain to him, for ignorance of Christ is the sole reason why we are puffed up with a vain confidence. Hence, where we see a false estimate of one’s own excellence, where we see arrogance, where we see pride, there let us be assured that Christ is not known.

Matthew Henry Presbyterian @wholebiblehenry

The apostle here proposes himself for an example of trusting in Christ only, and not in his privileges as an Israelite. I. He shows what he had to boast of as a Jew and a Pharisee. Let none think that the apostle despised these things (as men commonly do) because he had them not himself to glory in.

Commenting on Philippians 3:4-8

John Gill Reformed Baptist @doctorgill

But what things were gain to me,.... As circumcision, and the observance of the ceremonial law, which he thought were necessary to salvation; and his natural and lineal descent from Abraham, which he supposed entitled him to the favour of God, and eternal life, as well as to outward privileges; and his being of that strict sect of religion, a Pharisee, which he doubted not...