John Wesley on Matthew 10:27

Even what I now tell you secretly is not to be kept secret long, but declared publicly. Therefore, What ye hear in the ear, publish on the house - top - Two customs of the Jews seem to be alluded to here. Their doctors used to whisper in the ear of their disciples what they were to pronounce aloud to others. And as their houses were low and flat roofed, they sometimes preached to the people from thence. Luke 12:3.