All thoughts start from emotions.

Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.

Not to anticipate is already to moan.

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.

If you throw a stone in a pond... the waves which strike against the shores are thrown back towards the spot where the stone struck; and on meeting other waves they never intercept each other's course... In a small pond one and the same stroke gives birth to many motions of advance and recoil.

Avoid the precepts of those thinkers whose reasoning is not confirmed by experience.

Nature is constrained by the cause of her laws which dwell inborn in her. Variant: Nature is constrained by the order of her own law which lives and works within her.