The only true wisdom is in knowing you know nothing.
Every man has his secret sorrows which the world knows not; and often times we call a man cold when he is only sad.
A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.
Think left and think right and think low and think high. Oh, the thinks you can think up if only you try!
There are no facts, only interpretations.
The only thing necessary for the triumph of evil is for good men to do nothing.
Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for.
Peace cannot be kept by force; it can only be achieved by understanding.
If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster.
For those who live neither with religious consolations about death nor with a sense of death (or of anything else) as natural, death is the obscene mystery, the ultimate affront, the thing that cannot be controlled. It can only be denied.
You have come into a hard world. I know of only one easy place in it, and that is the grave.
There is no good in arguing with the inevitable. The only argument available with an east wind is to put on your overcoat.
There are only two forces that unite men - fear and interest.
The only thing to do with good advice is to pass it on. It is never of any use to oneself.
It is well with me only when I have a chisel in my hand.
Changes are not only possible and predictable, but to deny them is to be an accomplice to one's own unnecessary vegetation.
No one can persuade another to change. Each of us guards a gate of change that can only be opened from the inside. We cannot open the gate of another, either by argument or emotional appeal.
Bravery is being the only one who knows you're afraid.
A child educated only at school is an uneducated child.
The passions are the only orators which always persuade.