Lord Acton
Power tends to corrupt and absolute power corrupts absolutely.

Mahatma Gandhi
The only thing necessary for the triumph of evil is for good men to do nothing.

Martin Luther King
The time is always right to do what is right.

The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.

H.L. Mencken
If a politician found he had cannibals among his constituents, he would promise them missionaries for dinner.

G.B. Shaw
Liberty means responsibility. That is why most men dread it.