“As the deer longs for streams of water, so my soul longs for you, O God. My soul thirsts for God, the living God. When can I enter and see the face of God?” (Ps 42:2-3).
The deer, I learned from St. John Climacus in “The Ladder of Divine Ascent,” was seen by Christians up through his time (the seventh century) as a symbol of virtue, in part because people believed that a deer could suck a snake — a symbol of vice and of demons — up out of its den in the ground and swallow it whole.
That deer don’t actually do that is beside the point. In the modern age, men have come to view natural phenomena in the most materialistic of terms. Even if deer did suck snakes out of the ground and swallow them whole, we’d find video of the event on YouTube or the National Geographic channel to be fascinating, but our minds would never go where St. John’s, and the minds of hundreds of thousands of Christians before him, went.