Success sits on a mountain of mistakes.

Never say never or it becomes a vice, and there you have it, you just did it twice.

It’s easy to count other people’s mistakes. Make your own if you can.

If once he has got the right fingering, plays in good time, with the notes fairly correct, then only pull him up about the rendering; and when he has arrived at that stage, don’t let him stop for the sake of small faults, but point them out to him when he has played the piece through. . . I have always adopted this plan; it soon forms musicians which, after all, is one of the first aims of art and it gives less trouble both to master and pupil.

Victory is not possible, if one doesn't learn from the past and mistakes made.

A mistake is a stepping stone to success.