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So long as men can breathe or eyes can see,

So long lives this, and this gives life to thee.

Cowards die many times before their deaths;

The valiant never taste of death but once.

Shall I compare thee to a summer's day?

Thou art more lovely and more temperate:

Rough winds do shake the darling buds of May,

And summer's lease hath all too short a date

The assumption that anything true is knowable is the grandfather of paradoxes.

Cry 'Havoc!,' and let slip the dogs of war.

Men at some time are masters of their fates:

The fault, dear Brutus, is not in our stars,

But in ourselves, that we are underlings.

Friends, Romans, countrymen, lend me your ears;

I come to bury Caesar, not to praise him.

The evil that men do lives after them;

The good is oft interred with their bones.

The best paradoxes raise questions about what kinds of contradictions can occur—what species of impossibilities are possible.

Let me not to the marriage of true minds

Admit impediments.

Paradox is thus a much deeper and universal concept than the ancients would have dreamed. Rather than an oddity, it is a mainstay of the philosophy of science.

For the first time, he heard something that he knew to be music. He heard people singing. Behind him, across vast distances of space and time, from the place he had left, he thought he heard music too. But perhaps, it was only an echo.

"I liked the feeling of love," [Jonas] confessed. He glanced nervously at the speaker on the wall, reassuring himself that no one was listening. "I wish we still had that," he whispered. "Of course," he added quickly, "I do understand that it wouldn't work very well. And that it's much better to be organized the way we are now. I can see that it was a dangerous way to live."