Never pick a fight with an ugly person, they've got nothing to lose.
The heart has its reasons which reason knows not.
Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.
The secret of life, though, is to fall seven times and to get up eight times.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
Experience is merely the name men gave to their mistakes.
The most certain sign of wisdom is cheerfulness.
Nobody made a greater mistake than he who did nothing because he could do only a little.
Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.
Criticize the act, not the person.
Muddy water is best cleared by leaving it alone.
Only from the heart can you touch the sky.
What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.
There are no limitations to the mind except those we acknowledge.
Intelligence is a moral category.
Be sure you put your feet in the right place, then stand firm.
Fine clothes may disguise, but silly words will disclose a fool.
Almost every wise saying has an opposite one, no less wise, to balance it.
Sometimes you will never know the value of a moment until it becomes a memory.
When you learn, teach, when you get, give.
An understanding of the natural world is a source of not only great curiosity, but great fulfilment.