Here, touching something concerning the Sacrament of the Body of Christ, the complete doctrine is given; and how the soul proceeds from vocal to mental prayer, and a vision is related which this devout soul once received
And so, with exercise in perseverance, she will taste prayer in truth, and the food of the Blood of My only-begotten Son, and therefore I told you that some communicated virtually with the Body and Blood of Christ, although not sacramentally; that is, they communicate in the affection of charity, which they taste by means of holy prayer, little or much, according to the affection with which they pray. They who proceed with little prudence and without method, taste little, and they who proceed with much, taste much.
For the more the soul tries to loosen her affection from herself, and fasten it in Me with the light of the intellect, the more she knows; and the more she knows, the more she loves, and, loving much, she tastes much. You see then, that perfect prayer is not attained to through many words, but through affection of desire, the soul raising herself to Me, with knowledge of herself and of My mercy, seasoned the one with the other. Thus she will exercise together mental and vocal prayer, for, even as the active and contemplative life is one, so are they.
Although vocal or mental prayer can be understood in many and diverse ways, for I have told you that a holy desire is a continual prayer, in this sense that a good and holy will disposes itself with desire to the occasion actually appointed for prayer in addition to the continual prayer of holy desire, wherefore vocal prayer will be made at the appointed time by the soul who remains firm in a habitual holy will, and will sometimes be continued beyond the appointed time, according as charity commands for the salvation of the neighbor, if the soul see him to be in need, and also her own necessities according to the state in which I have placed her.
Each one, according to his condition, ought to exert himself for the salvation of souls, for this exercise lies at the root of a holy will, and whatever he may contribute, by words or deeds, towards the salvation of his neighbor, is virtually a prayer, although it does not replace a prayer which one should make oneself at the appointed season, as My glorious standard-bearer Paul said, in the words, ’He who ceases not to work ceases not to pray.’ It was for this reason that I told you that prayer was made in many ways, that is, that actual prayer may be united with mental prayer if made with the affection of charity, which charity is itself continual prayer.
I have now told you how mental prayer is reached by exercise and perseverance, and by leaving vocal prayer for mental when I visit the soul. I have also spoken to you of common prayer, that is, of vocal prayer in general, made outside of ordained times, and of the prayers of good-will, and how every exercise, whether performed in oneself or in one’s neighbor, with good-will, is prayer. The enclosed soul should therefore spur herself on with prayer, and when she has arrived at friendly and filial love she does so. Unless the soul keep to this path, she will always remain tepid and imperfect, and will only love Me and her neighbor in proportion to the pleasure which she finds in My service.”
Source: The Dialogue (CCEL)