The way I understand the concept of the Trinity is that god is the "one" reality, which is intrinsically unknowable, ( because we "live", unavoidably, in a world of models, each of us in a slightly different set of them ), omnipresent, ( all around us, close to us, just "hidden" from us by our "models", theories, perceptions, etc ), omniscient, omnipotent, etc.
Jesus Christ is subjective truth/reality, part of the "one" reality but divided/separated from it by the body, by our being physically limited in space and time; our bodies including our brains responsible for the models that we experience things through/with, necessarily totally individual but totally "true" for each one of us. The trick is to recognise and accept that it is neither the same thing as the ersatz "one" reality which we call objectivity, which is actually just the subjective reality of the largest/most powerful and most complex human social group at any moment, nor the same thing as the "one" reality, to see that it is located in space and time, and that it is totally "true" in that place and time, ( and what we eat determines to a great extent what it will be for each of us from moment to moment ).
And the "holy spirit" is that which we do not see/is invisible to us, that which is outside of/beyond our models of perception/understanding, ( those in vogue at any given period ), but also part of the "one" reality", just as involved in determining our models, experience, and actions, as those things/events ( causes ) that we have named/modelled.
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