The water which rises in the mountain is the blood which keeps the mountain in life. - Leonardo da Vinci

Just as eating against one’s will is injurious to health, so studying without a liking for it spoils the memory, and it retains nothing it takes in.

O neglectful Nature, wherefore art thou thus partial, becoming to some of thy children a tender and benignant mother, to others a most cruel and ruthless stepmother? I see thy children given into slavery to others without ever receiving any benefit, and in lieu of any reward for the services they have done for them they are repaid by the severest punishments.

Fire destroys falsehood, that is sophistry, and restores truth, driving out darkness.