Trust in what is good or right despite lack of evidence.

<Moral questions> immediately present themselves as questions whose solution cannot wait for sensible proof. A moral question is a question not of what sensibly exists, but of what is good, or would be good if it did exist. Science can tell us what exists; but to compare the <worths>, both of what exists and of what does not exist, we must consult not science, but what Pascal calls our heart.

 

The question of having moral beliefs at all or not having them is decided by our will. Are our moral preferences true or false, or are they only odd biological phenomena, making things good or bad for <us>, but in themselves indifferent? How can your pure intellect decide? If your heart does not <want> a world of moral reality, your head will assuredly never make you believe in one. 

 

William James - Will to Believe