God: "I looked for someone to take a stand for me, and stand in the gap" (Ezekiel 22:30)
We are justified not without works yet not through works, since in our sharing in Christ, which justifies us, [progressive] sanctification is just as much included as [imputed] righteousness.
However one chooses to interpret Revelation 3:20, it must not be thought that the sinner possesses the power to open his own heart to Christ. Only God can do this (John 6:44; Acts 16:14; James 1:18). Although God’s sovereignty in salvation does not negate our responsibility to proclaim the Gospel to all men, we must never suggest to people that the power to convert their hearts lies within them (Psalm 110:3; Philippians 1:29; 2 Timothy 2:24-26) (Darryl Erkel).
