Classicly

The great secret of life is to discover by a process of related effects, this common reality of experience. Most of mankind grope blindly in the dark, and miss it, and by a kind of frenzied and pitiable ignorance acquire the abnormal character of conduct. The poet discovers, or at least puts his being wholly at the disposal of, these secrets, wins a serene and contemplative relationship to these effects, and lives a normal spiritual life. Harmony and rhythm are but two common terms that express and designate infinity. There was a man who was so absolutely sane that the scoffers of his day called him mad—this man was William Blake.