Each problem that I solved became a rule which served afterwards to solve other problems.
Those who see the invisible can do the impossible.
There are things known and there are things unknown, and in between are the doors of perception.
The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.
Property is surely a right of mankind as real as liberty.
I hear and I forget. I see and I remember. I do and I understand.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.
Great dreams of great dreamers are always transcended.
There is nothing more uncommon than common sense.
There is always time to add a word, never to withdraw one.
Do not deny the classical approach, simply as a reaction, or you will have created another pattern and trapped yourself there.
One who loses wealth loses much. One who loses a friend loses more. But one who loses courage loses all.
You always admire what you really don't understand.
When prosperity comes, do not use all of it.
Why fit in when you were born to stand out?
A man may imagine things that are false, but he can only understand things that are true.
Colorless green ideas sleep furiously
He who chooses the beginning of the road chooses the place it leads to.
To avoid criticism say nothing, do nothing, be nothing.
If you would take, you must first give, this is the beginning of intelligence.