There is one that's actually not from a tech guru, but from a cleaning lady who quoted her father, he was a carpenter: "When it's done and it's good no one will ask you how long it took!"
Actually quite wise words, not always true but in the end people will look at the results and rarely about the process. But if you fail or deliver something bad ... that's a different topic.
Besides that I read a lot of books and listen to a lot of talks over years so most of the things I could say will pop up anyway, because they are at the core of our trade and so they get spread by devs who actually wanna be good in what they are doing.
But I'm looking forward for some pearls.