Thomas Aquinas,
Summa Theologiae — Question 30 - OF THE ANNUNCIATION OF THE BLESSED VIRGIN…
“ The imagination is indeed a higher power than the exterior sense: but because the senses are the principle of human knowledge, the greatest certainty is in them, for the principles of knowledge must needs always be most certain. Consequently Joseph, to whom the angel appeared in his sleep, did not have so excellent a vision as the Blessed Virgin. ”
