John Climacus, also known as John of the Ladder (579-649 A.D.), was a 6th–7th-century Christian monk at the monastery on Mount Sinai.  John came to the Vatos Monastery at Mount Sinai, now Saint Catherine’s Monastery, and became a novice when he was about 16 years old. He was taught about the spiritual life by the elder monk Martyrius. After the death of Martyrius, John, wishing to practice greater asceticism, withdrew to a hermitage at the foot of the mountain. In this isolation he lived for some twenty years, constantly studying the lives of the saints and thus becoming one of the most learned Church Fathers.  Of John’s literary output we know only the Κλῖμαξ (Latin: Scala Paradisi) or The Ladder of Divine Ascent, composed in the early seventh century.  

The Ladder describes how to raise one’s soul and body to God through the acquisition of ascetic virtues. Climacus uses the analogy of Jacob’s Ladder as the framework for his spiritual teaching. Each chapter is referred to as a “step”, and deals with a separate spiritual subject. There are thirty Steps of the ladder, which correspond to the age of Jesus at his baptism and the beginning of his earthly ministry. Within the general framework of a ‘ladder’, Climacus’ book falls into three sections. The first seven Steps concern general virtues necessary for the ascetic life, while the next nineteen (Steps 8–26) give instruction on overcoming vices and building their corresponding virtues. The final four Steps concern the higher virtues toward which the ascetic life aims. The final rung of the ladder—beyond prayer (προσευχή), stillness (ἡσυχία), and even dispassion (ἀπάθεια)—is love (ἀγάπη).  Originally written simply for the monks of a neighboring monastery, the Ladder swiftly became one of the most widely read and much-beloved books of Byzantine spirituality. This book is one of the most widely read among Orthodox Christians, especially during the season of Great Lent which immediately precedes Pascha (Easter). It is often read in the trapeza (refectory) in Orthodox monasteries, and in some places it is read in church as part of the Daily Office on Lenten weekdays, being prescribed in the Triodion.  An icon known by the same title, Ladder of Divine Ascent, depicts a ladder extending from earth to heaven.  Several monks are depicted climbing a ladder; at the top is Jesus, prepared to receive them into Heaven. Also shown are angels helping the climbers, and demons attempting to shoot with arrows or drag down the climbers, no matter how high up the ladder they may be. Most versions of the icon show at least one person falling. Often, in the lower right corner John Climacus himself is shown, gesturing towards the ladder, with rows of monastics behind him.