Eternal vigilance is the price of knowledge.

The unforgivable sin is the refusal to pardon.

To condemn spontaneous and delightful occupations because they are useless for self-preservation shows an uncritical prizing of life irrespective of its content.

It is right to prefer our own country to all others, because we are children and citizens before we can be travellers or philosophers.

He thinks he believes only what he sees, but he is much better at believing than at seeing.

My remembrance of the past is a novel I am constantly recomposing; and it would not be a historical novel, but sheer fiction, if the material events which mark and ballast my career had not their public dates and characters scientifically discoverable.

Nature drives with a loose rein and vitality of any sort can blunder through many a predicament in which reason would despair.