Observe always that everything is the result of a change, and get used to thinking that there is nothing Nature loves so well as to change existing forms and to make new ones like them. Book IV
Remember that to change thy opinion and to follow him who corrects thy error is as consistent with freedom as it is to persist in thy error. Book VIII
Fire tries gold, misery tries brave men. De Providentia
Whatever you would make habitual, practice it; and if you would not make a thing habitual, do not practice it, but accustom yourself to something else. Discourses
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