I would not say that ethical behavior is not possible for the atheist or agnostic. It is. A couple of pretty good examples are Bertrand Russell and Jean-Paul Sartre. However, I will have to say that if we take the human lot as a whole, these two men must be seen as exceptions.

Imagine a man besottedly in love: he won't waste time speculating whether other women equally merit his affection.

When there are miles to go before we sleep, altered traits are more important than altered states.

...conversation can be as mutually incomprehensible as foreign languages. We need the different and complementary perspectives of the various yogas - and ideally of all religions - not only to reach God but to reach each other.

Swallow your pride and admit that we all need help at times.

Built into human makeup is a longing for a 'more' that the world of everyday experience cannot requite.

...the single destination of sanctity could admit of so many different avenues leading to it.