The past is memory. The future is imagination. All that exists is now.

The exciting breakthrough of the 21st century will occur not because of technology, but an expanding of what it means to human. concept of what it means to be human.

Almost every significant breakthrough is the result of a courageous break with traditional ways of thinking.

It is a very great thing to be able to think as you like; but, after all, an important question remains: what you think.

Understanding a question is half an answer.

The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.

An idea, to be suggestive, must come to the individual with the force of revelation.

It is not reason which is the guide of life, but custom.

It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance.

To make a contented slave it is necessary to make a thoughtless one. It is necessary to darken the moral and mental vision and, as far as possible, to annihilate the power of reason.

There is nothing more frightful than ignorance in action.

It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about.

The thought of only being a creature of the present and the past was troubling. I longed for a future, too, with hope in it. The desire to be free, awakened my determination to act, to think, and to speak.

No thing great is created suddenly, any more than a bunch of grapes or a fig. If you tell me that you desire a fig, I answer you that there must be time. Let it first blossom, then bear fruit, then ripen.

You will find rest from vain fancies if you perform every act in life as though it were your last.

There is one thing stronger than all the armies in the world; and that is an idea whose time has come.

I think it’s important to realize that you can miss something, but not want it back.

Sometimes you will never know the value of a moment until it becomes a memory.