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Perhaps nature is our best assurance of immortality.

We are all working for the immortality of the human consciousness.

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.

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

The first requisite for immortality is death.

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

Immortality is a long shot, I admit. But somebody has to be first.

We are immortal until our work on earth is done.

The doctrine of immortality rests upon human affection. We love; therefore, we wish to live.

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