I would disagree. It may just be me, but I know that when I do something that I consider to be the 'right' thing...it has spiritual ramifications for me. I simply feel right. This feeling transcends the knowledge of "good" or "bad" in our society (sometimes doing the 'right' thing for me means doing something that is considered 'wrong' in the society I come from). I understand that there is probably a completely biological scientific explanation for such feelings, but that doesn't invalidate them in my mind. The fact is, when I do 'good' things, I feel more spiritually at peace and centered, and when I do 'wrong' things, I feel spiritually disjointed. That's my compass for morality and ethics, and it is very spiritual. But I understand that I may be unique in that regard.