Here are some quotes I have collected over the years:
“Beyond a moderate level of material comfort, happiness consists of two things: feeling connected to others and engaging in meaningful work.”
― William Deresiewicz
“No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable.”
― Socrates
“All models are wrong, but some are useful”.
― George E. P. Box
“The formulation of NP-completeness, and the proof that all these problems are equivalent, is a powerful thing: it says that all these open questions are really a single open question, a single type of complexity that we don’t yet fully understand.”
― Introduction To Algorithms: NP-Completeness