The Lord who bought Whom? Limited to the Church of God alone made up of His elected people

"Acts 20:28 reads, 'feed the church of God, which he hath purchased with his own blood.' This verse is often used to show that Jesus, who shed his blood, was himself God, the second Person of the Trinity. But for the present purpose let us note that his blood purchased the church. Liberals will complain at the base notion of a commercial transaction, but Paul, whose words they are, was never troubled on this score. The church had to be purchased and Jesus bought it: 'Ye are bought with a price' (1 Cor. 6:20 and 7:23); and 2 Peter warns against false prophets and false teachers who deny 'the Lord that bought them.' If, as Dr. Hendry claims, Christ did not have to fulfill any condition in order to save us, why did he have to be crucified? Why indeed did he have to come to earth at all?" - Gordon Clark, What do Presbyterians Believe?