There is a lovely story about Rabin at Meadowmount. Galamian put a challenge to his students playing a particular study that he would "give a dollar to any student who could play that etude from beginning to end at the lesson without a single note out of tune." The only student who got that dollar was Rabin.
So how did Rabin create such consistent accuracy in his playing?
When he was a child, Rabin had a little bowl with 6 marbles with him while he practised. Each time he played through a specific section of his music perfectly, he would put a marble in the bowl. If he made any error in a play through, all the marbles would come out, and he would start again. The goal was to have all 6 marbles in the bowl from 6 perfect run-throughs in a row.
It's a great way to prepare yourself for a concert! If you can perform a difficult section of music 6 times in a row... perfectly... you know you can get it perfect in concert.