Irenaeus of Lyons

Error, indeed is never set forth in its naked deformity, lest, being thus exposed, it should at once be detected. But it is craftily decked out in an attractive dress, so as, by its outward form, to make it appear to the inexperienced more true than truth itself.

For it is not needful, to use a common proverb, that one should drink up the ocean who wishes to learn that its water is salt.