Isolated from its source, becomes an idol

Holding [the Way of Affirmation], we see that every
created thing is, in its degree, an image of God,
and the ordinate and faithful appreciation of that
thing a clue which, truly followed, will lead back
to Him. Holding [the Way of Rejection], we see that
every created thing, the highest devotion to moral
duty, the purest conjugal love, the saint and the
seraph, is no more than an image; that every one
of them, followed for its own sake and isolated from
its source, becomes an idol whose service is damnation.
- C. S. Lewis (1898-1963), ArthurianTorso