There's a lot of craft in songwriting. The divine inspiration is when the idea comes. It may be a riff. It may be a word. It may be a phrase. It may be a title. Sometimes, in the best of both worlds, that divine inspiration extends through the whole song. I've literally sat down and written a song from beginning to end, almost complete lyrics and everything without ever stopping...in two minutes. The chorus of 'She's Gone' was like that..
Art leads to a more profound concept of life, because art itself is a profound expression of feeling. The artist is born, and art is the expression of his overflowing soul. Because his soul is rich, he cares comparatively little about the superficial necessities of the material world; he sublimates the pressure of material affairs in an artistic experience.
There is a field where all wonderful perfections of microscope and telescope fail, all exquisite niceties of weights and measures, as well as that which is behind them, the keen and driving power of the mind. No facts however indubitably detected, no effort of reason however magnificently maintained, can prove that Bach's music is beautiful.