Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

All that you accomplish or fail to accomplish with your life is the direct result of your thoughts.

Purity of heart is to will one thing.

One must judge men not by their opinions, but by what their opinions have made of them.

Fashion changes, but style endures.

The hardest thing to explain is the glaringly evident which everybody has decided not to see.

Courage is being scared to death... and saddling up anyway.

Everything beautiful has a mark of eternity.

It's better to be unhappy alone than unhappy with someone.

Genius is sorrow's child.

I don't watch television, I think it destroys the art of talking about oneself.

A person preaches well that lives well.

Science is not only compatible with spirituality; it is a profound source of spirituality.

It is a mistake to think you can solve any major problems just with potatoes.

All of us have moments in our lives that test our courage. Taking children into a house with a white carpet is one of them.

I am not now That which I have been.

That which costs little is less valued.

Only those with no memory insist on their originality.

A good goal is like a strenuous exercise - it makes you stretch.

Confusion of goals and perfection of means seems, in my opinion, to characterize our age.

Never go to a doctor whose office plants have died.