You should prefer a good scientist without literary abilities than a literate one without scientific skills

Love shows itself more in adversity than in prosperity; as light does, which shines most where the place is darkest.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.

In whatever system where the weight attached to the wheel should be the cause of motion of the wheel, without any doubt the center of the gravity of the weight will stop beneath the center of its axle. No instrument devised by human ingenuity, which turns with its wheel, can remedy this effect. Oh, speculators about perpetual motion, how many vain chimeras have you created in the like quest. Go and take you place with the seekers after gold.

Affective gestures pointing to things near either in time or space should be made with the hand not very far from the body of the person pointing; and if these things are distant, the hand of the painter should be more extended and the face turned toward the person to whom he is addressing the demonstration.

It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.

Our body is dependent on heaven and heaven on the Spirit.