I perceive that all Arts of all sorts and faculties, as well divine as profane, doth concur in the adorning of this skill of Heraldry.
– From Lacies Nobilitie by Sir John Ferne (1586), p85
“Profane” seems to be used here in the sense of “secular” rather than “sacreligious.”
Keeping in mind that Ferne is in fact a herald and not exactly the disinterested observer who says this in the text – he’s not wrong. At the very least, a good grasp of history and design are necessary, and research skills and multiple languages certainly don’t hurt either.