evidence

What in common language we call beauty, which is in harmony of lines, colors, sounds, or in grouping of words or thoughts, delights us only because we cannot help admitting a truth in it that is ultimate. "Love is enough," the poet has said; it carried its own explanation, the joy of which can only be expressed in a form of art which also has that finality. Love gives evidence to something which is outside us but which intensely exists and thus stimulates the sense of our own existence.

-- Rabindranath Tagore