Act as if the maxim of your action were to become through your will a general natural law
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
Good advice is always certain to be ignored, but that's no reason not to give it.
Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.
Immoderate desire is the mark of a child, not a man.
If you place your head in a lion's mouth, then you cannot complain one day if he happens to bite it off.
Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.
It is tact that is golden, not silence.
Men become wise just as they become rich, more by what they save than by what they receive.
No act of kindness, no matter how small, is ever wasted.
There is always time to add a word, never to withdraw one.
The heart has its reasons which reason knows not.
He who conquers others is strong; he who conquers himself is mighty.
Muddy water is best cleared by leaving it alone.
Reality leaves a lot to the imagination.
Man is the only creature who refuses to be what he is.
Do not pray for an easy life, pray for the strength to endure a difficult one.
You can best serve civilization by being against what usually passes for it.
To be one, to be united is a great thing. But to respect the right to be different is maybe even greater.
It has seemed to be more necessary to have regard to the weight of words rather than to their number.
Beauty is not in the face; beauty is a light in the heart.