<p>2:18 <i>For if I build up again those things which I destroyed, I prove myself a transgressor</i>- The &quot;things&quot; of justification by the Mosaic law. The same word is used by the Lord in saying that He had not come to &quot;destroy&quot; the Law but to fulfil it (Mt. 5:17). Paul surely alludes here, and understood the Lord to be saying that He had indeed come to destroy the Law, but through fulfilling it; and that although He had not at that early point in His ministry destroyed the Law, yet He would do so- in His death. Paul thus sees his own part in the things which the Lord Himself achieved, just as we too can play our part in things like reconciling the world to God, which were personally achieved by the Lord's sacrifice.</p>