“Knowing is not enough; we must apply. Willing is not enough; we must do.”

“Is it not enough that we cannot make one another happy, must we also rob one another of the pleasures that any heart may permit itself now and then? And name me a person who in a bad mood will be decent enough to hide it, to bear it alone, without destroying the joy around him. Is it not rather an inner dissatisfaction with our own unworthiness, a dislike of ourselves that is always associated with envy aggravated by foolish conceit? We see people happy and not made happy by us, and that is unbearable.”

“We must always change, renew, rejuvenate ourselves; otherwise, we harden.”

“Mephistopholese: But we, more cunning in our cares, Must take our joys before they fade.”

“One mind is enough for a thousand hands.”

“We know accurately only when we know little; doubt grows with knowledge.”

“It is not doing the thing we like to do, but liking the thing we have to do, that makes life blessed.”