Okay. I'll post it, but it won't exactly be an original thought.
"Results 1 - 10 of about 1,460,000 for man has a dual nature. (0.12 seconds)"
Man has a dual nature. He is, at the same time, animalistic in many processes. We eat and excrete, we live and die, we bring forth new life and witness the passing of the old.
No doubt many believe that is all there is to life, and seem motivated to grasp at everything they wish to possess, regardless of consequence.
What a limited world view! Man has another side as well. Even something so prosaic as the study of mathematics is a glorious accomplishment in comparison with the best of the animal kingdom.
I'd stack the Pythagorean Theorem up against enormous termite mounds or the great barrier reef any day.
Some of us even delve into this second nature to the neglect of the primary things. So-called ascetics who would rather explore mental and spiritual issues than partake of nourishing sustenance.
I would submit that our physical nature is a corollary to a vehicle which takes us farther and faster than we can proceed on our own. We provide the vehicle with the things needed for its proper functioning, and the fuel it requires, but otherwise, its purpose is to get us where we want to go.
So you always have to ask yourself, "Where do you want to go?"
It seems you gentlemen disagree, but that's okay. Have some Cuban black beans and grilled plantain, and pray for the conversion of Fidel Castro!