29 If Our Lord made such magnificent and solemn promises even to private prayers, how much more powerful must be that prayer which is said ex officio in the name of the Church, the beloved Spouse of the Savior? The Christian, though in prosperity so often forgetful of God, yet in the depth of his heart keeps his confidence in prayer, feels that prayer is all powerful, and as by a holy instinct, in every distress, in every peril whether private or public, has recourse with special trust to the prayer of the priest. To it the unfortunate of every sort look for comfort; to it they have recourse, seeking divine aid in all the vicissitudes of this exile here on earth. Truly does the "priest occupy a place midway between God and human nature: from Him bringing to us absolving beneficence, offering our prayers to Him and appeasing the wrathful Lord."
Source: Ad Catholici Sacerdotii (Vatican.va)