The gem cannot be polished without friction, nor man perfected without trials.
Settle one difficulty, and you keep a hundred away.
Knowledge is merely brilliance in organization of ideas and not wisdom. The truly wise person goes beyond knowledge.
When a wise man points at the moon the imbecile examines the finger.
If what one has to say is not better than silence, then one should keep silent.
Everything has beauty, but not everyone sees it.
Ignorance, the root and stem of every evil.
I am the wisest man alive, for I know one thing, and that is that I know nothing.
Never memorize something that you can look up.
One is always a long way from solving a problem until one actually has the answer.
The thing about smart people is that they seem like crazy people to dumb people.
Don't waste your time with explanations: people only hear what they want to hear.
The simple things are also the most extraordinary things, and only the wise can see them.
The secret of life, though, is to fall seven times and to get up eight times.
Sanity doesn’t suffer, ever.
When I argue with reality, I lose—but only 100% of the time.
The price of greatness is responsibility.
A fanatic is one who can't change his mind and won't change the subject.
It is never too late to give up your prejudices.
There are a thousand hacking at the branches of evil to one who is striking at the root.
Say what you have to say, not what you ought. Any truth is better than make-believe.
Intelligence is the ability to adapt to change.
Turn and face the strange changes.
What I like to do is try to make a difference with the work I do.
I am easily satisfied with the very best.
Speak in extremes, it'll save you time.
The man of knowledge must be able not only to love his enemies but also to hate his friends.
Common sense is not so common.
The moment you know you know you know.
Discipline is the bridge between goals and accomplishment.
Honesty is the first chapter in the book of wisdom.
Memory is the mother of all wisdom.
Wisdom is the daughter of experience.
In every walk with nature one receives far more than he seeks.