EASY ANTI CALVINIST QUESTION ANSWERED
1) The Calvinist teaching actually is that man (because of his sin bound will) will not (if left to himself) open the door. When his will is freed from the dominion of sin by the power of the truth of the gospel (which alone has the capacity to set him free) then he will willingly open the door.
2) By standing and knocking at the heart's door, the responsibility of the sinner is clearly to be seen. This leads to added guilt if the door remains shut. The sinner will keep the door shut when he loves darkness rather than light. This is the sole cause of his condemnation. (John 3:19)
3) Christ is not only knocking the door, but speaking, for Revelation 3:20 (which, I assume, is in mind here) speaks about hearing His voice. The voice of the Lord carries the needed power to change and thus enable the hitherto wicked and stubborn heart to change. In Acts 16:14 (with a change of emphasis) the Lord Himself is said to open Lydia's heart so that Christ might enter in.
4) The above comments on Calvinism concentrates on a single issue within Calvinism where Calvinism itself does not concentrate. The symmetry of Calvinism lies in its Biblical balance between the sovereignty of God and the responsibility of man. It also lies in its balance between God's decree and God's use of means to fulfil that decree. The question above maintains a focus on the sovereignty of God alone.
Not sure whether the above is meant to be a criticism of Calvinism. Perhaps it is wrong to assume that it is such.
See also: Revelation 3:20 and Calvinist evangelism
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