Drive out nature with a pitchfork, and she will always come back. 

Animals hear about death for the first time when they die.

Nature’s rules have no exceptions.

A righteous man regardeth the life of his beast.

Nature resolves everything into its component elements, but annihilates nothing.

When you have only two pennies left in the world, buy a loaf of bread with one, and a lily with the other.

We never are definitely right; we can only be sure we are wrong.