Even though Thérèse does not have a true and proper doctrinal corpus, nevertheless a particular radiance of doctrine shines forth from her writings which, as if by a charism of the Holy Spirit, grasp the very heart of the message of Revelation in a fresh and original vision, presenting a teaching of eminent quality.

The core of her message is actually the mystery itself of God-Love, of the Triune God, infinitely perfect in himself.

If genuine Christian spiritual experience should conform to the revealed truths in which God communicates himself and the mystery of his will (cf. Dei Verbum, n. 2), it must be said that Thérèse experienced divine revelation, going so far as to contemplate the fundamental truths of our faith united in the mystery of Trinitarian life.

At the summit, as the source and goal, is the merciful love of the three Divine Persons, as she expresses it, especially in her Act of Oblation to Merciful Love.

At the root, on the subject’s part, is the experience of being the Father’s adoptive children in Jesus; this is the most authentic meaning of spiritual childhood, that is, the experience of divine filiation, under the movement of the Holy Spirit.

At the root again, and standing before us, is our neighbour, others, for whose salvation we must collaborate with and in Jesus, with the same merciful love as his.

Through spiritual childhood one experiences that everything comes from God, returns to him and abides in him, for the salvation of all, in a mystery of merciful love. Such is the doctrinal message taught and lived by this Saint.

John Paul II (1920-2005): Divini Amoris Scientia, 8 (on the declaration of St Thérèse of the Child Jesus [1873-1897] as a Doctor of the Church).