Meaning
The vocation of the Discalced Carmelite Nuns is a gift of the Spirit. [Love is the source] Through it, they are called to a hidden union with God in friendship with Christ, in familiarity with the Blessed Virgin Mary, and in an existence in which prayer and immolation [Love is the means] blend into a great love for the Church [Love is the goal]. (Const. No. 10)
Note: The italic annotations are not in the original text of the Constitutions. They are added here for clarification.
Practice
To live in allegiance to Christ by serving him faithfully with a pure heart and an upright conscience, by placing our sole hope of salvation in him, and by paying him obedience, in the person of the Prior, in a spirit of faith (Const. No. 3a).