John Climacus was a 6th–7th century Christian monk, philosopher, and abbot who lived at the monastery on Mount Sinai. Also known as John of the Ladder, he is celebrated as a significant mystic and saint within the Catholic and Eastern Orthodox traditions. While some traditions suggest he entered the monastery as a teenager, other historical perspectives indicate he may have practiced law before joining the monastic life in his forties. He is most famous for his influential spiritual writings that guide the soul toward God through ascetic practice.