Life and Conversion
The synaxarion relates that Hesychius lived during the sixth century at a monastery on Mount Horeb. In his early monastic life he was not noted for fervor.
He fell gravely ill and died, but about an hour later he returned to life. The vita attributes this to a wondrous act of Divine Providence. Following this near-death experience, he withdrew into his cell as a recluse and spent the remaining twelve years of his life in complete silence and solitude, occupied with the Psalms and with weeping in repentance.
Before his death he is said to have addressed the assembled monks with a single counsel: that one who acquires the remembrance of death cannot sin.
Legacy
The tradition associates Hesychius with the hesychasts — ascetics who keep silence and devote themselves to the contemplation of God and to unceasing prayer of the heart — describing them as his spiritual descendants.
He is a genuinely obscure saint: a search of the Mystagogy Resource Center for material on Hesychius of Mount Horeb returned no dedicated coverage, confirming that little is recorded of him beyond the synaxarion entry.
Distinct from Hesychius of Sinai
Hesychius of Mount Horeb should not be confused with Hesychius of Sinai, a separate figure. Hesychius of Sinai was a hieromonk at Saint Catherine's Monastery on Mount Sinai, identified by the Greek Orthodox Synaxarion as hegumen of the monastery in the seventh century, and the author of a collection of two hundred ascetic maxims, "On Temperance and Virtue," included in the Philokalia.
Hesychius of Sinai is commemorated on March 29 in the Eastern Orthodox calendar and on October 3 in the Roman Catholic calendar. Although the two saints share an October 3 commemoration in some traditions, they are distinct persons: Hesychius of Mount Horeb was a sixth-century monk and recluse transformed by a near-death experience, not the Philokalic author.