Complacency is the enemy of study.

All political power comes from the barrel of a gun. The communist party must command all the guns, that way, no guns can ever be used to command the party.

Deaths have benefits. They can fertilise the ground.

Maybe you're afraid of sinking. Don't think about it. If you don't think about it, you won't sink. If you do, you will.

Civilize the mind but make savage the body.

All genuine knowledge originates in direct experience.

Political power grows out of the barrel of a gun.

To Be Attacked by the Enemy Is Not a Bad Thing but a Good Thing.

In time of difficulties, we must not lose sight of our achievements.

Enable every woman who can work to take her place on the labour front, under the principle of equal pay for equal work.

The people, and the people alone, are the motive force in the making of world history.

I think I will drink my hemlock now....

Thinking is easy, acting difficult, and to put one's thoughts into actions the most difficult thing in the world.

In the last few centuries we've managed to reduce how much we kill each other, we've learned some basic lessons about public health, and life is relatively good for more people than ever before.

If you really believe death leads to eternal bliss then why are you wearing a seatbelt?

The one way to discover about aliens is to tune your radio telescope and listen to the signals.

But no temple made with hands can compare with Yosemite. Every rock in its walls seems to glow with life...as if into this one mountain mansion Nature had gathered her choicest treasures.

Of course I am not religious — I don't in fact see how any scientist who thinks at all deeply can be so.

Laugh out, O stream, from your bed of green, / Where you lie in the sun's embrace; / And talk to the reeds that o'er you lean / To touch your dimpled face.

The ultimate comfort zone is within.

I was born in Massachusetts and lived there until I was thirteen years old.