9. The primary source of her spiritual experience and her teaching is the Word of God in the Old and New Testaments. She herself admits it, particularly stressing her passionate love for the Gospel (cf. Ms A, 83v). Her writings contain over 1,000 biblical quotations: more than 400 from the Old Testament and over 600 from the New.

Despite her inadequate training and lack of resources for studying and interpreting the sacred books, Thérèse immersed herself in meditation on the Word of God with exceptional faith and spontaneity. Under the influence of the Holy Spirit she attained a profound knowledged of Revelation for herself and for others. By her loving concentration on Scripture - she even wanted to learn Hebrew and Greek to understand better the spirit and letter of the sacred books - she showed the importance of the biblical sources in the spiritual life, she emphasized the originality and freshness of the Gospel, she cultivated with moderation the spiritual exegesis of the Word of God in both the Old and New Testaments. Thus she discovered hidden treasures, appropriating words and episodes, sometimes with supernatural boldness, as when, in reading the texts of St Paul (cf. 1 Cor 12-13), she realized her vocation to love (cf. Ms B, 3r-3v). Enlightened by the revealed Word, Thérèse wrote brilliant pages on the unity between love of God and love of neighbour (cf. Ms C, 11v-19r); and she identified with Jesus' prayer at the Last Supper as the expression of her intercession for the salvation of all (cf. Ms C, 34r-35r).

Her doctrine, as was said, conforms to the Church's teaching. From childhood she was taught by her family to participate in prayer and liturgical worship. In preparation for her first Confession, first Communion and the sacrament of Confirmation, she gave evidence of an extraordinary love for the truths of the faith, and she learned the Catechism almost word for word (cf. Ms A, 37r-37v). At the end of her life she wrote the Apostles' Creed in her own blood, as an expression of her unreserved attachment to the profession of faith.

In addition to the words of Scripture and the Church's doctrine, Thérèse was nourished as a youth by the teaching of the Imitation of Christ, which, as she herself acknowledges, she knew almost by heart (cf. Ms A, 47r). Decisive for fulfilling her Carmelite vocation were the spiritual texts of the Mother Foundress, Teresa of Jesus, especially those explaining the contemplative and ecclesial meaning of the charism of the Teresian Carmel (cf. Ms C, 33v). But in a very special way, Thérèse was nourished on the mystical doctrine of St John of the Cross, who was her true spiritual master (cf. Ms A, 83r). It should cause no surprise, then, if she who had been an outstanding pupil in the school of these two Saints, later declared Doctors of the Church, should later become a master of the spiritual life.