St. Paul the Hermit (230-342)
A well-educated member of the upper class, Paul escaped the persecution of Decius by taking refuge in a mountain desert, where he lived in a cave for ninety years, in mortification and prayer. He is known as the first hermit.

Reflections from the Saints

People who change their way of life and begin to think about spiritual progress also begin to suffer from the tongues of detractors. Whoever has not yet suffered this trial has not yet made progress, and whoever is not ready to suffer it does not even endeavor to progress.
– St. Augustine