… But I Cannot refrain from reminding you that it is not enough for you to appear before the face of the Lord in the temple, which is outside of you. You must also erect a temple of the Lord within yourselves so as to always have Him in you and by you. If the following words of the Apostle apply to all so much more do they speak straight to you: know ye not that you are the temple of God? (l Cor. 3:16). And also, if to all, then especially to you must refer the commandment: …As unto a living stone, sis allowed indeed of men, but chosen of God, and precious, ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, to God by Jesus Christ (1 Peter 2:4-5).
It is profitable for you to think about this now that the temple has been constructed and consecrated. This temple is the direct image of the invisible temple, which it necessary to construct for Him in our hearts. To this already-erected, visible temple, therefore, devote also other labor that knows no end— the construction in one’s heart of an ever-spiritual temple for the Lord.
St. Theophan the Recluse, Kindling the Divine Spark, pp. 73-78