The three theological virtues of faith, hope and charity, aided by the highest and most sublime gifts of the Holy Spirit, such as understanding, wisdom, knowledge, and counsel, unite the creature, the human spirit, with his God, the souls with the Word of God. It is this sacred union that you must seek, hold and possess; in it lie the spiritual life, health and strength, and from it originate all the other virtues.

Letter to Juana Gratia (1857)