I like to think of these two proverbs together:
“He who fails to plan, plans to fail,”
“We plan, God laughs.”
I also like these quotes from Thomas Edison:
"Opportunity is missed by most people because it is dressed in overalls and looks like work."
"Restlessness and discontent are the first necessities of progress."
"It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work."
"If we did all the things we are capable of, we would literally astound ourselves."