Most Catholics pray. Far fewer have ever been taught to pray — in the sense of systematic, attentive, interiorly engaged prayer that forms the person who prays. The tradition distinguishes between vocal prayer (the recitation of set prayers: the Our Father, the rosary, the Hours), mental prayer (interior meditation on Scripture or the mysteries of faith), and contemplative prayer (the quiet, loving attention to God that begins to overflow from the other two). Most Catholics never move beyond vocal prayer — not from lack of desire but from lack of instruction. The great teachers of prayer wrote to remedy exactly that lack.
The mystics of the Church — Teresa of Ávila, John of the Cross, Francis de Sales, Thérèse of Lisieux — wrote not for spiritual eccentrics but for ordinary Christians who wanted to go deeper. Their books are also, frequently, among the most beautiful works in European literature. Reading them is not merely instructive; it is itself a form of prayer. Teresa's Interior Castle describes the soul as a castle of many mansions and the spiritual life as a journey inward toward the God who dwells in the innermost room. De Sales describes the same journey in more practical, methodical terms for people who live in courts and workshops rather than Carmelite enclosures. John of the Cross describes what happens when the journey becomes difficult — when God removes the consolations of prayer and the soul must continue in naked faith.
The curriculum below is ordered progressively. Begin with de Sales and Thérèse — they are the most accessible and the most immediately practical. Move to Teresa of Ávila when you have established a regular habit of mental prayer and are ready to understand its stages. The Liturgy of the Hours should be begun as early as possible: it is the Church's official daily prayer, and praying it with the Universal Church — even one or two Hours a day — transforms the structure of the day in ways that private devotion alone cannot.