You can reasonably make the intellectual journey from thinking it's permissible to eat shrimp to thinking it's not permissible, or vice versa, whereas our slavery journey was uni-directional. We are as certain we are not going back to that old kind of slavery as we are that we aren't going back to the geocentric universe.

Human courtship has some wild extremes. At one end of the spectrum, there is harassment, pestering, blackmail, and an abuse of institutional power, which its targets rightly fear and loathe. At the other end is love, which as Nietzsche said, is beyond good and evil and always deserves our respect and compassion even when it is doomed or destructive. In the wide middle of the spectrum are all the ambiguous and tragi-comic goings-on of our species.

About 70% of what I've written about is centered on the clashes and conformities between the emerging life and physical sciences and older metaphysical frameworks in the 17th and 18th centuries. The other 30% consists of one-off essays or researches into other intriguing contemporary topics such as visual experience, aesthetics, social justice issues, and the epistemology of moral knowledge.

Order can arise from chaos without anyone or anything directing the process when unstable combinations of atoms perish and others persist. In the 17th century, Descartes applied this insight to cosmology, and long before Darwin presented his more rigorous ideas about variation and selection, people began to speculate more openly about the origins of life and the species in Epicurean terms.

You can reasonably make the intellectual journey from thinking it's permissible to eat shrimp to thinking it's not permissible, or vice versa, whereas our slavery journey was uni-directional. We are as certain we are not going back to that old kind of slavery as we are that we aren't going back to the geocentric universe.

Moral theory develops from the divine command theory of medieval Christian philosophy, mixed up with a bit of ancient pagan virtue theory, to the purely secular moral sentiment and interpersonal reaction theories of Smith and Hume, to Kant's attempt to restore command theory but with something supersensible in the individual rather than God as the source of authority.

Some critics thought the ontology and theory of qualities absurd. No one had ever seen these little atoms, and furthermore, how could their mere arrangement produce a noisy, colourful, world in which day followed night and animals generated their own kind? Instead of a world created, cared, for and supervised by supernatural persons, the Epicureans appeared to the theologians to be assigning everything to chance. The latter were appalled by Lucretius's view of religion as cruel and oppressive and by the Epicurean insistence that death is the end of all experience.