“I would have written a shorter letter, but I didn’t have time.”

"Don't confuse starting fast with finishing fast."

Take your time, i'm in a hurry. - The emperor of china to the guy who helped him dress

What if your greatest strength is moving fast while making less mistakes than others, how do you identify when slowing down is valuable? Isn't the point of moving slow just to train yourself to go fast?

Somebody drives race cars

This phrase is also a mantra of the US Navy SEALs.

Really any US military outfit. I was airborne infantry in the US ARMY and this was our mantra when learning anything new.