Destiny is not a passive agent that lies in the lap of the Gods, but is an active instrument that lies in your own hands to shape as you will.

Rational discussion is useful only when there is a significant base of shared assumptions.

Tact is the knack of making a point without making an enemy.

Mistakes are always forgivable, if one has the courage to admit them.

What's real and what's true aren't necessarily the same.

Nature is pleased with simplicity. And nature is no dummy

The ultimate authority must always rest with the individual's own reason and critical analysis.

Intelligence is a moral category.

Act enthusiastic and you will be enthusiastic

Science has not yet taught us if madness is or is not the sublimity of the intelligence.

What can't be cured must be endured.

Do not reveal what you have thought upon doing, but by wise council keep it secret being determined to carry it into execution.

Empty pockets never held anyone back. Only empty heads and empty hearts can do that.

It is hard to fight desire; but to control it is the sign of a reasonable man.

Every intelligent individual wants to know what makes him tick, and yet is at once fascinated and frustrated by the fact that oneself is the most difficult of all things to know.

True knowledge lies in knowing how to live.

Each problem that I solved became a rule which served afterwards to solve other problems.

Talent is God given. Be humble. Fame is man-given. Be grateful. Conceit is self-given. Be careful.

Love one another, but make not a bond of love: Let it rather be a moving sea between the shores of your souls.

There are two educations. One should teach us how to make a living and the other how to live.

Generosity is giving more than you can, and pride is taking less than you need.