Today we had a course on the matter of quality. I contributed two paraphrased sayings during this. This is the first one:

The master has failed more times than the beginner has even tried.

Stephen McCranie

Copied for the blog from https://www.goodreads.com/quotes/1252243-the-master-has-failed-more-times-than-the-beginner-has

The second appears to be less specifically cited to one source in particular. It goes like this: Good, Fast, Cheap. Pick two.

Searching the web for this turns up the Wikipedia article on the "Project management triangle" which lists scope, cost, and time as the corners. The middle of this triangle is labeled as quality. Here's another article about it, referring to the three points with my terms.