Final answer:
The belief not held by Darwin is that human morality evolved from the social instincts of animals. This concept aligns with social Darwinism, which Darwin would not have endorsed. Instead, Darwin focused on natural selection principles regarding descent, variation, and competition for resources.
Step-by-step explanation:
The concept that is not one of Darwin's beliefs, as detailed in his works, is the idea that human morality had evolved from the social instincts of animals, especially the bonds of sympathy and love. This concept is more associated with Herbert Spencer and his promotion of social Darwinism, a misapplication of Darwin's work on natural selection that Darwin himself would have rejected. In contrast, Darwin's core beliefs revolved around the notions that all life is likely descended from 'one primordial form,' more individuals are produced than can survive, and individuals within a species show variation with offspring tending to inherit their parents' characteristics. These principles are key to understanding evolution by natural selection.