Waiting until you fully understand something before you pour yourself into it is how you stay half-taught.
Knowing part of something and acting on the whole of it is what generates heat, and heat is what makes work accurate rather than sloppy, because people get details right about what they burn for and wave their hands at everything else. Fervency sets the state, the state sets the standard, and the standard shows up as teaching about Jesus that people can rely on.
A man who postpones speaking until his grasp of the way of the Lord is complete keeps himself cool and unfindable, and correction never reaches him, because instruction arrives to people already in motion. What that delay costs is not accuracy but the people he would have reached while he was getting ready.