Christian Perfection & Contemplation: According to St. Thomas Aquinas and St. John of the Cross

Abp. Lefebvre recommended this.

"Is the infused contemplation of the mysteries of faith and the union with God which results therefrom an intrinsically extraordinary grace, or is it, on the contrary, in the normal way of sanctity?" Fr. G.-L. argues it is in the normal way of sanctity.

Fr. Royo-Marín, O.P., says (Theology of Christian Perfection p. 183 // PDF p. 95) that ch. 6 ("THE CALL TO CONTEMPLATION OR TO THE MYSTICAL LIFE") is a must-read to understand the universal call to the mystical life. He says it's a "point of convergence for all the schools of spirituality".

Christian Perfection and Contemplation is an entire treatise on the
operation of grace in the spiritual life that clearly and skillfully
explains the great principles of the spiritual life according to St.
Thomas Aquinas and other sterling Catholic Sources. In fact, the
author's fascinating and extremely informative footnotes are themselves
worth the price of the book. Impr. 470 pgs,