We all yearn to be in the literal presence of the Holy Trinity in heaven. As one wise priest told me, that yearning will help each of us to better refuse sin
The Holy Spirit does not have form and can not be seen, except in the sort of metaphorical ways that have been mentioned above or that were described in the Bible (the Holy Spirit has appeared in the form of “tounges of fire” for instance).
‘If you then, though you are evil, know how to give good gifts to your children, how much more will your Father in heaven give the Holy Spirit to those who ask him!’ - Luke 11:13
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