The vocation of the Discalced Carmelite Nuns is essentially ecclesial and apostolic. (Const. No. 126)
A. Apostolic life
The apostolate to which Saint Teresa wished to dedicate her daughters is the purely contemplative one. It consists in prayer and immolation with the Church and for the Church, and it exclude every form of active apostolate. (Const. No. 126)
The Discalced Carmelite Nuns are united with Christ who intercedes for us and offers himself for us. With him, they offer themselves to God, and complete what is lacking in the passion of the Lord in favor of his Mystical Body (Col. 1:24). In this way, they open themselves to the action of the Holy Spirit who guides the Church and gives it life; and they move toward achieving that pure and solitary love which is more precious in God's sight and of greater profit for the Church than a great many other works taken together. (Const. No. 126)
B. Consecrated Life
The very nature of the Teresian charism demands that the prayer of a Discalced Carmelite and the consecration of all her energies be directed to the salvation of souls. (Const. No. 10)
The evangelical counsels of chastity, poverty and obedience are founded on the teaching and examples of Christ the Master. They are a gift of the Spirit to the Church. When religious profess them by means of public vows, they follow more closely the form of life which the Son of God chose for himself and which his Mother embraced. And so they live for God alone, they love him above all things, and they unite themselves in a special way to the Church and to its mystery. (Const. No. 21)
Consecrated Chastity
The very nature of the Teresian charism demands that the prayer of a Discalced Carmelite and the consecration of all her energies be directed to the salvation of souls. (Const. No. 10)
The sisters imitate Christ in his virginity, in order to be holy in body and in soul (1Cor. 7:34). They profess by vow the evangelical counsel of chastity, which involves the obligation of perfect continence in celibacy for the Kingdom of heaven (Mt. 19:12). (Const. No. 26)
Poverty
Obedience
Servant of God
The foundation of the consecrated life is obedience, the sure way for clinging to the will of God and reaching perfection. The nuns will imitate their Spouse, Yahweh's Servant, by making themselves slaves of God, branded with the mark of the cross, so that they may be spiritually at the service of all their sisters and brothers in Christ, and more specifically, at the disposition of the entire community and of each one of the sisters. (Const. No. 41)
Union with God's Will
By professing with a vow the evangelical counsel of obedience, religious imitate Christ who came into the world in order to do the will of the Father (Jn. 4:34; 5:30) and who made himself obedient unto death on the cross (Phil. 2:8). Following his example, they offer to God the full dedication of their will as a self-sacrifice. They thereby unite themselves more intently to the salvific will of the Father. (Const. No. 40)
Evangelical Self-denial
The Discalced Carmelite Nuns who follow the gospel path of Christ must conform themselves to his example and share in his mission of salvation. This means that they must renounce their very selves. Because Jesus had invited them to join his group of disciples, they accept his call to take up their cross daily (Lk. 9:23). Since they are aware of their sinfulness, they acknowledge their need for repentance which, to be true, requires that external practices be closely united to conversion of heart. (Const. No. 46)
Penance
The Discalced Nuns are called to prayer and contemplation, and they should keep in mind that "prayer and self-indulgence do not go together." The generous practice of penance is an integral part of the contemplative life. Nevertheless, in their penitential practices, they should stress the interior spirit and the exercise of virtues more than the rigors of corporal mortification, keeping in mind that the Lord is more concerned "with love than the magnificence with which works are done." For this reason their first concern will be to acquire the sovereign virtues of sisterly love, detachment and humility. (Const. No. 48)