God's biggest plan was not just to live with man, but to dwell in us:
"2For all those things hath mine hand made, and all those things have been, saith the LORD: but to this man will I look, even to him that is poor and of a contrite spirit, and trembleth at my word." (Isaiah 66: 2)
Before his martyrdom, Stephen referenced Isaiah:
"48Howbeit the most High dwelleth not in temples made with hands; as saith the prophet,
49Heaven is my throne, and earth is my footstool: what house will ye build me? saith the Lord: or what is the place of my rest?
50Hath not my hand made all these things?" (Acts 7: 48-50)
Nothing that he said could complement what the Holy Spirit did within him:
"When they heard these things, they were cut to the heart, and they gnashed on him with their teeth. 55But he, being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God, 56And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God." (Acts 7: 54-56)
Because of His Spirit, God lives within us.
In fact, that is God's perfect will:
"27To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory: 28Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus: 29Whereunto I also labour, striving according to his working, which worketh in me mightily." (Colossians 1:27-29)
Because of all that Jesus did at the Cross, God can now live in us, His Temple!