He who fears death dies every time he thinks of it.

I believe, indeed, that it is more laudable to suffer great misfortunes than to do great things.

To believe with certainty, we must begin with doubting.

Have the courage to face a difficulty lest it kick you harder than you bargain for.

Is it not astonishing that the love of repose keeps us in continual agitation?

Reason shows us our duty; he who can make us love our duty is more powerful than reason itself.

Science when well-digested is nothing but good sense and reason.