The man who never in his mind and thoughts travel'd to heaven is no artist.

The man who never in his mind and thoughts travel'd to heaven is no artist.

The man who never alters his opinions is like standing water, and breeds reptiles of the mind.

In every cry of every man,In every infant's cry of fear,In every voice, in every ban,The mind-forged manacles I hear.

Puts all Heaven in a Rage.

To see a world in a grain of sand And a heaven in a wild flower, Hold infinity in the palm of your hand And eternity in an hour. ot their name. William James's mysticism chapter from 'Varieties of Relligious Experience' may help here.