St. Seraphim of Sarov, a Russian monk of the nineteenth century, went into the forest with his disciple, Motovilov, during a snowstorm. While praying, St. Seraphim became iridescent in appearance, to the point of emitting what was for Motovilov an almost blinding light. Accompanying this glow was a warmth in the midst of the Russian winter snow, along with a beautiful fragrance and unspeakable joy and peace. St. Seraphim attributed this blessed state to his having acquired the Holy Spirit, or deification. [source]