Remigius of Auxerre
Catena Aurea · Matthäusevangelium 10
Fear them not therefore: for there is nothing covered, that shall not be revealed; and hid, that shall not be known. What I tell you in darkness, that speak ye in light: and what ye hear in the ear, that preach ye upon the housetops. And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.
The meaning therefore is, What I say to you in darkness, that is, among the unbelieving Jews, that speak ye in the light, that is, preach it to the believing; what ye hear in the ear, that is, what I say unto you secretly, that preach ye upon the housetops, that is, openly before all men. It is a common phrase, To speak in one’s ear, that is, to speak to him privately.