Gravity is only the bark of wisdom's tree; but it preserves it
It is easy to be brave at a safe distance.
It is a wise man that does know the contented man is never poor, whilst the discontented man is never rich.
Science is organized knowledge. Wisdom is organized life.
You are not a drop in the ocean. You are the entire ocean, in a drop.
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.
Wrong life cannot be lived rightly.
It takes a lot of courage to show your dreams to someone else.
It takes a great man to be a good listener.
Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.
The difference between stupidity and genius is that genius has its limits.
One must wait until the evening to see how splendid the day has been.
You can be rich in spirit, kindness, love and all those things that you can't put a dollar sign on.
Every aquarium will eventually leak.
Strength does not come from physical capacity. It comes from an indomitable will.
Don't criticize what you can't understand.
The impossible could not have happened, therefore the impossible must be possible in spite of appearances.
Nature is pleased with simplicity. And nature is no dummy
Nothing is more intolerable than to have to admit to yourself your own errors.
We are all born ignorant, but one must work hard to remain stupid
There is always time to add a word, never to withdraw one.