once you have tasted the taste of sky, you will forever look up

A day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.

It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.

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.

He who can copy can do.

He who wishes to be rich in a day will be hanged in a year.

A bird maintains itself in the air by imperceptible balancing, when near to the mountains or lofty ocean crags; it does this by means of the curves of the winds which as they strike against these projections, being forced to preserve their first impetus bend their straight course towards the sky with divers revolutions, at the beginning of which the birds come to a stop with their wings open, receiving underneath themselves the continual buffetings of the reflex courses of the winds.