Ammo for use Against Skeptics

1
I came across ths quote used in another context, but which might come in handy the next time a skeptic says that astrology is irrational or unreasonable.

"Imagination does not breed insanity. Exactly what does breed insanity is reason. Poets do not go mad; but chess players do. Mathematicians go mad .. but creative artists very seldom."

It is attirbuted to G.K. Chesterton, but I have no original source. Still I like it.

Tom