Adherence to dogmas has destroyed more armies and cost more battles than anything in war.

All things are difficult before they are easy.

We never know the worth of water till the well is dry.

You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.

You cannot change how someone thinks, but you can give them a tool to use which will lead them to think differently.

In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete.

There is nothing in a caterpillar that tells you it's going to be a butterfly.

If you have knowledge, let others light their candles in it.

Pollution is nothing but the resources we are not harvesting. We allow them to disperse because we've been ignorant of their value.

Today a reader, tomorrow a leader.

Mistakes are great, the more I make the smarter I get.

Don't say "The last one there is a rotten egg": unless you're absolutely sure there's a slow kid behind you.

I don't miss anything about the 1960s, not really. I did it. It's like asking, 'Do you miss the fourth grade?' I loved the fourth grade when I was in it, but I don't want to do it again.

The true task is to unite and organize all workers...and it is the workers themselves who must secure freedom for themselves.

I think Hillary Clinton - first of all, it's a great victory, acknowledge it. She has made history.

Under certain circumstances, profanity provides a relief denied even to prayer.

Do not be too timid and squeamish about your actions.

First and foremost, any business proposal I like must sound fun.

I do disapprove very strongly of labelling children, especially young children, as something like 'Catholic children' or 'Protestant children' or 'Islamic children.'

Women will forgive anything. Otherwise, the race would have died out long ago.

I don't belong. Not here. Not now. I have to get back there. The bet was rigged, he made me believe. Now there's darkness in my soul. I want to die . . . again. But I choose to come back, why?