The biblical basis of this practice is
St. Paul's advice to his disciple Timothy whom he appointed bishop. St. Paul told him to "Attend to reading." The word "attend" an allusion to the many other concerns that a bishop has to attend to. By this, according to St.
Alphonsus Liguori, Doctor of the Church on Moral theology, the Apostle Paul "wished him to apply to the reading of holy books, not in a passing way and for a short time, but regularly and for a considerable time." The Fathers of the Church recommended this practice: St.
Jerome says that when we pray we speak to God; but when we read, God speaks to us. St.
Ambrose of Milan says the same: "We address him when we pray; we hear him when we read." Spiritual reading is an instruction in prayer and virtue, according to St.
Bernard of Clairvaux, and thus he said that "spiritual reading and prayer are the arms by which hell is conquered and paradise won." St.
Josemaría Escrivá explained that spiritual reading "builds up a store of fuel. — It looks like a lifeless heap, but I often find that my memory, of its own accord, will draw from it material which fills my prayer with life and inflames my thanksgiving after Communion." (The Way 117) Spiritual reading provides access to spiritual advice from masters of spirituality, says St.
Alphonsus Liguori. "When I read holy books," says St. Gregory the Theologian about the books of St. Basil the Great, "then the spirit and body are illumined and I become the temple of God and the harp of the Holy Spirit, played by divine powers through them I am corrected and through them I receive a kind of divine change and I am made into a different person." Reading of holy books is also a way to fight
temptations: "Endeavor to have always in your hand a pious book," advised St. Jerome to his disciple Salvina, "that with this shield you may defend yourself against bad thoughts." All the
founders of
religious institutes have strongly recommended this holy exercise to their religious, said St. Alphonsus. ==Examples of sanctifying effect==