“Time travel may be possible, but it is not practical.”

We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

Science is beautiful when it makes simple explanations of phenomena or connections between different observations.

The meaning in life is not out there but in between our ears. In many ways this makes us the lords of creation.

One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don’t throw it away.

I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

There is no unique picture of reality.

People who boast about their I.Q. are losers.

The thing about smart people is that they seem like crazy people to dumb people.

If aliens visit us, the outcome would be much as when Columbus landed in America, which didn’t turn out well for the Native Americans.

Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.

We don’t let animals suffer, so why humans?

The more you learn, the more you know. The more you know, the more you forget. The more you forget, the less you know. So why bother to learn.

Love the neighbour. But don’t get caught.

Nothing is better than reading and gaining more and more knowledge.

I think the human race doesn’t have a future if we don’t go into space. We need to expand our horizons beyond planet Earth if we are to have a long-term future.

I’m not afraid of death, but I’m in no hurry to die.

I shall earnestly and persistently continue to urge all women to the practical recognition of the old Revolutionary maxim. Resistance to tyranny is obedience to God.

Violence is sometimes a very practical solution but I don’t think it is the ultimate solution.

As for poverty, no one need be ashamed to admit it, the real shame is in not taking practical measures to escape from it.

I just feel like I influence people because I’m like – I was practically homeless.

In practical life we are compelled to follow what is most probable ; in speculative thought we are compelled to follow truth.

My art is capable of liberating man from the tyranny of the practical, rational world.

Bitcoin isn’t currently practical for very small micropayments.

I do not think much of the good luck theory of self-made men. It is worth but little attention and has no practical value.