Till now man has been up against Nature; from now on he will be up against his own nature.

I don't think it's the nature of any man to be monogamous. Men are propelled by genetically ordained impulses over which they have no control to distribute their seed.

If you listen to nature, you will never loose the equilibrium

The more we study human nature, the less we think of men - the more of man

Hand it to him, and he will turn away. Take it from him, and he quickly runs after it.

Men argue, nature acts