The truth of things is the chief nutriment of superior intellects.
O speculators about perpetual motion, how many vain chimeras have you created in the like quest? Go and take your place with the seekers after gold.
Just as courage is the danger of life, so is fear its safeguard.
The mind that engages in subjects of too great variety becomes confused and weakened.
All thoughts start from emotions.
The noblest pleasure is the joy of understanding.