Symeon the New Theologian (949-1022 AD) was a Byzantine Christian monk and poet, and was canonized as a saint by the Eastern Orthodox church. He wrote much about Christian mysticism, including his own experiences.
Saint Teresa of Ávila (1515-1582) was a Spanish mystic, Carmelite nun, and was canonized a Roman Catholic saint by Pope Gregory XV. In her autobiography, The Life of St. Teresa of Jesus, she describes many of her ecstatic visions of the Divine which should ring a few bells for Latter-day Saints.
In 1979 she had an experience while giving a eulogy at the funeral of a friend that forever changed her life. She later called it a "near-death-like" experience, being similar to many NDEs (including one she had earlier in life), but she was not near death at all. She describes it in one place this way...
Sophia von Klingnau was a nun who lived in a convent in Klingnau, Switzerland, sometime in the 13th or 14th century. Her writings were published in the Schwesterbücher (Sister Books).
Rabindranath Tagore (1861-1941) was a Bengali author, poet, essayist, playwright, novelist, composer, and painter. He won the Nobel Prize in Literature in 1913, the first non-European to do so. He recounted the following experience that he had while in Calcutta, India.
Thomas Merton (1915-1968) was a Catholic writer, theologian, Trappist monk, and mystic. The following is from his book New Seeds of Contemplation, describing his experiences in contemplation...
I shared this account in my introductory paper about mysticism, but I think it should be shared as a stand-alone post as well. This is because it is so stunningly similar in many respects to Joseph Smith's accounts of the First Vision.
Bill Wilson, the cofounder of Alcoholics Anonymous (AA), had a spiritual awakening that involved bright light, sometimes referred to as his “hot flash” or “white light transformation.”
A divine light is directed on me, penetrating this glow in which I am contained...
I suddenly entered the heart of a reality so blindingly obvious, so total, so enlightening, so luminous, that I wondered how I had never before realized how easy this reality was to find and how easily I found myself in it.