Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so. You must not lose faith in humanity. Humanity is an ocean if a few drops of the ocean are dirty, the ocean does not become dirty.
He who runs to the doctor, vaidya, or hakim for every little ailment, and swallows all kinds of vegetable and mineral drugs, not only curtails his life, but by becoming the slave of his body instead of remaining its master, loses self-control, and ceases to be a man.
Man has reason, discrimination and free-will such as it is. The brute has no such thing. It is not a free agent, and knows no distinction between virtue and vice, good and evil. Man, being a free agent, knows these distinctions, and when he follows his higher nature, shows himself far superior to the brute, but when he follows his baser nature can show himself lower than the brute.
It's very dangerous to mix up the words natural and habitual. We have been trained to be quite habitual at communicating in ways that are quite unnatural.