I think that is a useful admonition, and reason to save and reflect on the thoughts of those who have gone before us. Here are a handful of my favorites - I'll post more from time to time.
"Be kind, for everyone is fighting a great battle." Philo of Alexandria
“A government big enough to give you everything you want is a government big enough to take from you everything you have.” Gerald Ford, Address to a Joint Session of Congress, August 12, 1974
"If ye love wealth greater than liberty, the tranquility of servitude greater than the animating contest for freedom, go home from us in peace. We seek not your counsel, nor your arms. Crouch down and lick the hand that feeds you; May your chains set lightly upon you, and may posterity forget that ye were our countrymen." Samuel Adams