Henry Osborn Taylor,
The Mediaeval Mind (Volume 2 of 2…
“ While every illumination is inner knowledge (omnis illuminatio cognitio interna sit) we may distinguish the external light, (lumen exterius) , to wit, the light of mechanical art; the lower light, to wit, the light of sense perception; the interior light, to wit, the light of philosophical cognition; the superior light, to wit, the light of grace and Holy Scripture. The first illuminates as to the arts and crafts ”
