Among other possibilities, money was invented to make it possible for a foolish man to control wise men; a weak man, strong men; a child, old men; an ignorant man, knowledgeable men; and for a dwarf to control giants.
After some point, working harder makes achieving the goal harder or even impossible.
You can know a lot and still be stupid.
Most people master the art of wasting a life.
Plants are more courageous than almost all human beings: an orange tree would rather die than produce lemons, whereas instead of dying the average person would rather be someone they are not.
Some people will insult your intelligence by suddenly being nice or nicer to you once you make it … or they think you have.