It's something that's very often said that philosophy, as opposed to science, never makes any progress.

I don't think I can write the story of my life, but I can write the story of my hair.

It was while I was studying philosophy that I came to understand. . . that it is no sign of moral or spiritual strength to believe that for which one has no evidence, neither a priori evidence as in math, nor a posteriori evidence as in science. . . . It's a violation almost immoral in its transgressiveness to shirk the responsibilities of rationality.

If there is such a thing as philosophical progress, then why - unlike scientific progress - is it so invisible? Philosophical progress is invisible because it is incorporated into our points of view. What was torturously secured by complex argument comes widely shared intuition, so obvious that we forget its provenance.

Everybody is struggling to refine their views in opposition to the other people. And that's one of the most important things that philosophy actually has to teach us that you have to air your views and bring them to the table with people - with whom you disagree very much.

If we look at our attitudes consistently and work out the logical implications we're on the road to moral progress, moral understanding.

Math . . . music .. . starry nights . . . These are secular ways of achieving transcendence, of feeling lifted into a grand perspective. It's a sense of being awed by existence that almost obliterates the self. Religious people think of it as an essentially religious experience but it's not. It's an essentially human experience.