Another Shaw quotation that some people wanted to verify. Personally, I hope I do not become a habit myself.
The Simpleton of the Unexpected Isles (1934):
PRA. No matter: we shall both disappear presently; and I have still some curiosity left. Did you ever really care for me? I know I began as a passion and have ended as a habit, like all husbands; but outside that routine there is a life of the intellect that is quite independent of it. What have I been to you in that life? A help or a hindrance?