All truth is a shadow, except the last; but every truth is a substance in its own place, though it be but a shadow in another place; and the shadow is a true shadow, as the substance is a true substance.
The Life of a Christian (1653)
Sometimes misquoted as "Every truth is a shadow [...]"
Also quoted by William Ralph Inge in: Proceedings of the Aristotelian Society, 1918-1919 (p. 272)