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The first requisite for immortality is death.

There is only one way to get ready for immortality, and that is to love this life and live it as bravely and faithfully and cheerfully as we can.

Perhaps nature is our best assurance of immortality.

The only thing wrong with immortality is that it tends to go on forever.

Immortality is a by-product of good work.

I don't believe in personal immortality; the only way I expect to have some version of such a thing is through my books.

I would like immortality.

Immortality may be impossible, but imagine what humanity could learn if we all lived 700 years. We could travel deep into utopia and beyond.

Immortality is to live your life doing good things, and leaving your mark behind.

If your contribution has been vital there will always be somebody to pick up where you left off, and that will be your claim to immortality.