What for Emerson happens when doubt creeps between two friends

"Friendship, like the immortality of the soul, is too good to be believed. The lover, beholding his maiden, half knows that she is not verily that which he worships; and in the golden hour of friendship, we are surprised with shades of suspicion and unbelief. We doubt that we bestow on our hero the virtues in which he shines, and afterwards worship the form to which we have ascribed this divine inhabitation. "