Summary: The mystics know the Most Holy Trinity as a verb more than a noun.
Considering the Most Holy Trinity with affection
1. The mystics know the Most Holy Trinity as a verb more than a noun, like Lady Julian of Norwich, "Greatly ought we to rejoice that God dwells in our soul..." And, St. Elizabeth of the Trinity, a Carmelite nun: “God loves us,… to the point of making the center of our being "another heaven"--the place where God dwells, always present, always accessible and longing for intimate relationship with us; And Margery Kempe, “God the Father sits on a golden cushion, in honor of his might and power; Christ sits on a cushion of red; and the Holy Ghost,” the sanctifier, “sits on a white cushion, because He is full of love and cleanness.” (The Book of Margery Kempe, 188).
These mystics use the affective mode of mediation stemming from their God-given insights; it’s the level of feelings; an emotionalization wherein the worshipper seeks to imagine the sights, sounds, tastes, movement, and touch of specific scenes from the Gospel in order to engage and reinforce learning, and compassion, and to highlight that God is loving and accessible.
e.g. from Our Gospel today on John 3:16-- a banker in New York had a great desire to encourage some soldiers who were fighting during World War II. But, he could not get permission to visit the war zone personally. But his longing desire to help these men was not to be easily thwarted, so he called on a firm which manufactured advertising novelties and had them make several thousand small mirrors about three inches in diameter. On the celluloid back of each of these mirrors he had printed the words of John 3:16. Beneath the words of this inscription was written, "If you want to see who it is that GOD loves and for whom He gave His Son, look on the other side." These mirrors were distributed among the soldiers with the permission of the officers, and thus each man looking into the mirror would see the object of GOD's love and the one whom the SAVIOUR came to save.
I could not find the exact mirror as described on the internet but I did find a compact mirror that flips open with the John 3:16 verse printed on the outside. I have it with me if you want to see if after Mass.
2. Another example of using Affective Meditation on the Most Holy Trinity as a tool for helping train the mind and heart to generate thoughts comes from Father Richard Rohr. The technique is to imagine that for every problem, there are always THREE elements at work, called The Law of Three.
An example comes from Canada, from a woman who is the director of a small government-subsidized service agency. She had to appear before a provincial board each spring to orally defend her budget and make her request for the next year’s funds.
As she waited her turn in a seemingly endless litany of petitions from the heads of other agencies, she pictured the situation according to the Law of Three. First force was clearly held by the presenters, with their legitimate need and desperation for funding. Holy denying was quite literally held by the board, which seemed of a mind to throw out a certain number of requests altogether and substantially trim back the rest. She realized that in this configuration the two opposing forces were colliding on an energetic ground of scarcity—the assumption that there was not enough to go around. There was no third force. Could she do anything to create it?