I’ve discussed “preparationism” before here (along with some definition). Recently while looking for some more Puritan works on Rev 3:20 I came accross this quote which combines an understanding of Rev 3:20 as a “conversionist appeal” with a disavowal of preparationism:
Fifthly, Get this principle riveted in your hearts, That the want of preparations or qualifications that many men lay great stress upon, shall be no impediment to hinder your soul’s interest in Christ, if you will but open to Christ, and close with Jesus Christ. Rev 3:20, ‘Behold I stand at the door and knock: if any man hear my voice, and open to me, I will come in to him, and will sup with him, and he with me.’ Pray tell me at whose door was this that Christ stood and knocked? Was it not at the Laodicean’s door? Was it not at their door that thought their penny was as good silver as any? that said they were rich and had need of nothing, when Christ tells them to their very faces, ‘that they were poor, and miserable, and blind, and naked.’ None more unprepared, and unfitted for union and communion with Christ than these lukewarm Laodiceans; and yet the Lord Jesus is very ready and willing that such should have intimate communion and fellowship with him.
‘If any man will open, I will come in to him, and will sup with him, and he with me.’ The truth if this you have further evidenced, Prov i. 20-24, and viii. 1-6, and ix. 1-6. All these scriptures with open mouth speak out the truth asserted, viz. That the want of preparations or qualifications shall not hinder the soul’s interest in Christ, if the soul will adventure itself by faith upon Christ. I pray, what qualifications and preparations had they in Ezek. xvi., when God saw them in their blood, and yet that was a time of love…
Thomas Brooks, Works 3:204-5
So we see an evangelistic or conversionist use of Rev 3:20 in yet another Puritan and also we see Brook’s denial of “preparationism”. None of this is to denigrate the importance of preaching the law or of conviction of sin – but neither of these is the warrant of faith.