Guard against Heresy

And my advice to my readers is to adopt a similar expedient [as Ulysses], viz., either on account of their infirmity to smear their ears with wax, and sail through the tenets of the heretics, not even listening to [doctrines] that are easily capable of enticing them into pleasure, like the luscious lay of the Sirens, or, by binding one's self to the cross of Christ, hearkening with fidelity, not to be distracted, inasmuch as he has reposed his trust in Him to whom before this he has been firmly knit, and to continue steadfastly.

Hippolytus, The Refutation of All Heresies, Book VII