The future is not to be forecast, but created.

Religion is the most malevolent of all mind viruses.

If there are any gods whose chief concern is man, they can't be very important gods.

We stand now at the turning point between two eras. Behind us is a past to which we can never return...

The realisation that our small planet is only one of many worlds gives mankind the perspective it needs to realise sooner that our own world belongs to all its creatures.

When you finally understand the universe, it will not only be stranger than you imagine, it will be stranger than you can imagine.

Before the current decade ends, fee-paying passengers will be experiencing suborbital flights aboard privately funded vehicles. . . . It won't be too long before bright young men and women set their eyes on careers in Earth orbit and say: "I want to work 200 kilometers from home-straight up!"