Do not look the other way; do not hesitate. Recognize that the world is hungry for action, not words. Act with courage and vision.

The animal is one with its life activity. It does not distinguish the activity from itself. It is its activity. But man makes his life activity itself an object of his will and consciousness. He has a conscious life activity. It is not a determination with which he is completely identified.

The philosophers have only interpreted the world, in various ways: the point, however, is to change it.

The stern compression of circumstances, the twinges of adversity, the spur of slights and taunts in early years, are needed to evoke that ruthless fixity of purpose and tenacious wit without which great actions are seldom accomplished.

Education is the most powerful weapon which you can use to change the world.

You can't stop a bird from landing on your head. But you can keep it from building a nest.