He has prepared for you His presence as an abode, for as the Apostle Paul teaches, in Him we live and move and have our being.
[...] What can be sweeter than to have life in Him, who is the Blessed Life itself?
[...] What can be more desirable than by prayer and conversation to be continually in Him, in whom alone is true being, nay rather who alone is true being, without whom nothing can have wellbeing.
[...] When He created you,… where did He appoint your dwelling? What abiding-place did He prepare for you?
Hear what He says unto His own in the Gospel: Abide in Me, and I in you.
O inestimable dignity, O blessed abiding-place, O glorious intercourse between God and man!
How great the condescension of the Creator that it should be His will that His creature should dwell in Him!
How incomprehensible the blessedness of the creature, that he should abide in his Creator!
How great the glory of the rational creature to have communion with his Creator in so blessed an intercourse, that the Creator Himself should abide in the creature, the creature itself in the Creator!
So excellently then were we by His will created, so mercifully was He pleased that we should abide in Him.
[...] He then, though He is nowhere absent, chose for Himself a kingdom of delight within us, according to the witness of the Gospel, where it is said, The kingdom of God is within you.
But if the kingdom of God is within us, and God dwells in His kingdom, does He not abide in us, since His kingdom is within us?
Certainly He does; for if God is wisdom, and the soul of the righteous is the seat of wisdom, then he who is truly righteous has God abiding in him.
For the temple of God is holy, says the Apostle, which temple you are.
[...] He Himself says of His own, I will dwell in them and walk in them.
[...] Let us therefore, as is right, give to so great a tenant the whole command of our body, so that nothing in us may be displeasing to Him, but that all our thoughts and motions of our will, all our words and works, may wait upon His pleasure, obey His will, and be ordered by His governance.
For so we shall be in truth His kingdom, and He will abide in us, and we, abiding in Him, shall live well.
Anselm of Canterbury (1033-1109): Meditations, 1,3.