How could it be that I had a legal obligation to kill people I did not know, and who did certainly not consent to it, while my father's doctor could not help my father to die when my farther asked for it? My consternation brought me to moral philosophy and a life-long search for an answer to the question when and why we should, and when we shouldn't, kill.

We should not accept moral nihilism unless we find strong arguments to do so.

I am now a decided non-naturalist realist. And today we may even speak of a trend towards non-naturalist moral realism.

I wanted to know what it means to know something, whether we can know at all, and, if so, how.

There are some particular moral truths that I believe we have access to (such as the one not to inflict pain on a sentient being for no reason).

People in different cultures think very differently about abortion. Abortion is not seen as a moral problem for example in Sweden or Russia, but it is seen as a difficult moral problem in China and in the USA.

You are only allowed to treat the content of your intuition as evidence if the intuition stays after you have exposed it to cognitive psychotherapy; in some cases you have to reject it even if it does indeed stay.