Here’s a bit more on Christian Humanism, the point being simple:
That: Teaching outside of the bible is not necessarily “unbiblical” teaching.
(I’ll take a good quote from nearly anyone.)
Of course, if I were trying to convince you otherwise, that’s exactly what I would get you to focus on…
Certainly the theology of the humanists—with its emphasis on literature over philosophy, and on the wisdom to be gained from pagan classical writers and thinkers—is dramatically different from that of the schoolmen, but it is not on that account less theological, or less Christian. But such was the story—a secularizing story—that came to be told, by admirers of the humanist enterprise and its detractors alike.
-Alan Jacobs, The Year Of Our Lord 1943 (Amazon)