Naturalism is defined as the view that the universe operates according to the laws of physics without any supernatural influence or guidance.

“Naturalism being the view that the universe is just stuff obeying laws of physics, that there's no extra supernatural deities or demigods or evil spirits or good spirits pushing us around and affecting our lives or giving us guidance or anything like that.”

Science, including physics and natural selection, does not undermine morality but can instead guide humanity toward it.

“one of the things that I've always been very concerned with um is trying to show uh that science um starting with physics, going to theory of natural selection and onward, neuroscience, it doesn't undermine um our morality. It can be used to help us, guide us toward morality.”