All our knowledge has its origins in our perceptions.

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.

Make yourself a master of perspective, then acquire perfect knowledge of the proportions of men and other animals.

The knowledge of the past times and of the places of the earth is both an ornament and nutriment to the human mind.

You can have no dominion greater or less than that over yourself.

When counting, try not to mix chickens with blessings.

Whatever you do in life, if you want to be creative and intelligent, and develop your brain, you must do everything with the awareness that everything, in some way, connects to everything else.