It would be a pity if, frustrated by the price of travel, we elected to become a society that never made contact, that never gave SETI a fair chance.

The factor most ignored in discussing interstellar flight is the kinetic energy that must be invested in the ship to make its tons of matter move at a substantial fraction of the speed of light.

Antimatter is not a source of energy for us, it's a method of storing energy, compact but inefficient.

No one can deny the excitement of visiting another world.

Years of science fiction have produced a mindset that it is human destiny to expand from Earth, to the Moon, to Mars, to the stars.

Above all, I would not expect a wise race, at great expense, to set loose an army of self-replicating robots.

Present annual world energy consumption is about equal to the annihilation energy of 4 tons of matter.

In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory.

Be a man: accept the challenge of the unknown, of the beyond. Let it become a great dream in your being.

To be serious, if we were only interested in earning big money then a politician would have to go and work in industry.

I just want to repeat that there's nothing that we've proposed that would make it harder for you to purchase a firearm.

What's the most important thing in the world? It's love, and I look at that as an energy, not a sentiment.

Jobs are created in the private sector. Not by the president or the government unless they're government jobs.

You succeeded at your attempts to make me Need you desperately to vindicate me

In the United States, the political system is a very marginal affair. There are two parties, so-called, but they're really factions of the same party, the Business Party.

Read. Always read. No one can take that away from you.

See challenges vs. roadblocks.

Unless our souls had root in soil divine We could not bear earth's overwhelming strife. The fiercest pain that racks this heart of mine, Convinces me of everlasting life.