Philosophy goes no further than probabilities, and in every assertion keeps a doubt in reserve.
Of all the evil spirits abroad at this hour in the world, insincerity is the most dangerous.
Ignorance is the dominion of absurdity.
A person possessed with an idea cannot be reasoned with.
In everyday things the law of sacrifice takes the form of positive duty.
Every one of us ... knows better than he practices, and recognizes a better law than he obeys.