In Galatians 2:18, Paul writes, "If I rebuild what I destroyed, I prove that I am a lawbreaker." What is he referring to when he mentions rebuilding what was destroyed and how does that answer the objection that is raised in verse 17?
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To understand what Paul is saying here in Galatians 2:17-18 it is helpful to read the context starting from Galatians 2:3-14.
However, to cut to the chase - Paul "destroyed" or "tore down" the idea that a person can be justified by the Abrahamic/Mosaic laws of circumcision/diet.
When Paul states, "...I prove that I am a lawbreaker.", he is saying that if he were to "put back into place" the idea that one can be saved through the works of the law (as Peter was hypocritically suggesting in Gal 2:11-14), then he (Paul) would be amiss.
I don't make a habit out of reading the New Living Translation, but its paraphrase on Gal 2:17-18 may be more helpful to you than the thoughts that I've shared already.
According to early church interpretation it's the law or the works of the law.1
1: Tertullian, adv. Marc., 5,3,8; Eusebius of Emesa, in Gal.; Ephrem, in Gal.; Augustinus, Exp. Gal. 16,7-10; Ambrosiaster; Theodoret of Cyrus