Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.

Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.

Sensations are nothing but confused modes of thinking.

Situations in life often permit no delay; and when we cannot determine the course which is certainly best, we must follow the one which is probably the best. This frame of mind freed me also from the repentance and remorse commonly felt by those vacillating individuals who are always seeking as worthwhile things which they later judge to be bad.

De omnibus dubitandum

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

And thereby make ourselves, as it were, the lords and masters of nature.