Activity is the only road to knowledge.

A serious illness or a death advertises the doctor exactly as a hanging advertises the barrister who defended the person hanged.

If I refuse to allow my leg to be amputated, its mortification and my death may prove that I was wrong; but if I let the leg go, nobody can ever prove that it would not have mortified had I been obstinate. Operation is therefore the safe side for the surgeon as well as the lucrative side.

Hell is not all paved with bad intentions.

Patriotism is your conviction that this country is superior to all others because you were born in it.

The real pleasure of one's life is the devotion to a great objective of one's consideration.

If you don't begin to be a revolutionist at the age of twenty, then at fifty you will be a most impossible old fossil. If you area red revolutionary at the age of twenty, you have some chance of being up-to-date when you are forty!