Charles Spurgeon Commentary Galatians 2:18

"For if I build up again those things which I destroyed, I prove myself a transgressor." — Galatians 2:18 (ASV)

For if I build again the things which I destroyed, I make myself a transgressor.

If I once said I would not trust in my good works, and now go back to trust in them, I have already, whatever may be my outward conduct, perpetrated a great sin.