But isn’t there a hardness of heart among us when we do not care for the sinner both bodily and spiritually? A hardened heart does not hear the word of God. A hardened heart does not melt before the holiness of God nor care for brothers or sisters who are walking too close to the worldly culture of our day.
Yes, a church of the heart will share; reaching out to the poor and needy, but there is something more. There is a complete picture of the early beginnings of the church of Acts. “So then, those who had received his word were baptized; and that day there were added about three thousand souls. They were continually devoting themselves to the apostles’ teaching and to fellowship, to the breaking of bread and to prayer."
So these four things comprise a complete picture of those four areas important to the first Christians:
1. The apostle’s teaching
3. The Lord’s Supper but probably meals together also
And the apostle’s teaching, which is doctrine, would have included this verse which undoubtedly was an ancient hymn of the Church:
“By common confession, great is the mystery of godliness:
He who was revealed in the flesh,
Was vindicated in the Spirit,
Seen by angels,
Proclaimed among the nations
Believed on in the world
Taken up in glory. (1 Timothy 3:16)
And this, "But you, beloved, building yourselves up on your most holy faith, praying in the Holy Spirit, keep yourselves in the love of God, waiting anxiously for the mercy of our Lord Jesus Christ to eternal life. And have mercy on some, who are doubting, save others, snatching them out of the fire; and on some have mercy with fear, hating even the garment polluted by the flesh." (Jude 20-23)
 With Calvin we must agree that God’s Church is not limited to the New Testament it is also found in the Old Testament.