Never lend your car to someone you've given birth to.

I am not ashamed to confess that I am ignorant of what I do not know.

Pain is inevitable. Suffering is optional.

Pretty much, Apple and Dell are the only ones in this industry making money. They make it by being Wal-Mart. We make it by innovation.

The good times of today are the sad thoughts of tomorrow.

It is the story that owns and directs us. It is the thing that makes us different from cattle; it is the mark on the face that sets one people apart from their neighbors.

All the perplexities, confusion and distress in America arise, not from defects in their Constitution or Confederation, not from want of honor or virtue, so much as from the downright ignorance of the nature of coin, credit and circulation.

Blessed are the cracked, for they shall let in the light.

Anything that makes weak - physically, intellectually and spiritually, reject it as poison.

For the meaning of life differs from man to man, from day to day and from hour to hour. What matters, therefore, is not the meaning of life in general but rather the specific meaning of a person's life at a given moment.

A hero cannot be a hero unless in a heroic world.

He who never made a mistake, never made a discovery.

Every man is guilty of all the good he did not do.

Tell me thy company, and I shall tell thee what thou art.

There's real poetry in the real world. Science is the poetry of reality

If one is to be called a liar, one may as well make an effort to deserve the name.

Nothing is black or white.

Boards don't hit back.

Sanity is a madness put to good uses.

All tyranny needs to gain a foothold is for people of good conscience to remain silent.

I sound my barbaric yawp over the rooftops of the world.