The mission of the priest is to mediate between God and man. This mission is two-fold for he offers Christ to the Trinity when he offers the host during the consecration, and then at communion he distributes to the faithful the Bread of Life giving Christ to the world.
For this divine task Christ-like souls are needed, which is why Carmelites pray for priests. The whole Church should help priests to acquire this Christ-like soul, but contemplatives in particular come to their aide.This apostolic element of the Teresian charism is found in The Way of Perfection where St. Teresa of Jesus exhorts her nuns to:
“strive to be the kind of persons whose prayers can be useful in helping those servants of God who through much toil have strengthened themselves with learning and a good life and have labored so as now to help the Lord.” (Way of Perfection 3:2)
This apostolate of those who dwell in cloisters is to silently immolate their lives in purity, simplicity and crucified.
Since the priest is another Christ and is to communicate Christ to the world, he needs an interior life even though he may be busy. However, he can only do that in the measure in which he possess Jesus himself. Therefore, contemplatives need to pray for priests asking God to help them to remain ever at the fountain of living water so that He can overflow on those around him without ever becoming empty himself.
While the priest carries Christ to souls in word and sacrament, contemplatives then stay close to the feet of Christ in silent adoration, like Mary beside the cross, asking Him to render the priest’s words fruitful in souls. The contemplative does this to help priests and for the redemption of souls.
“I beg you to strive to be such that we might merit from God two things: First, that among the numerous learned men and religious there be many who will meet these requirements I mentioned that are necessary for this battle, and that the Lord may prepare those who do not meet them; one who is perfect will do much more than many who are not. Second, that after being placed in this combat, which as I say, is not easy, they may receive protection from the Lord so as to remain free of the many perils there are in the world, and stop their ears in order not to hear the siren’s song on these dangerous sea. If we can obtain some answers from God to these requests , we shall be fighting for Him even though we are very cloistered.” (Way of Perfection 3:5)