When we hear of the phrase “Knocking God”, we are often reminded of the Bible verse from Revelation 3:20 which states, “Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.”
This is God knocking at the door of a sinner’s heart seeking to Commune with the one who responds.

But God is not only knocking at the door of the sinner’s heart. He is knocking at the heart of the saint (the one who is sanctified by the blood of Jesus, for having believed in Him) as well. Song of Solomon 5:2 states, that the beloved (God) is knocking and asking his loved one to open unto Him.
This is God knocking at the door of a saint’s heart seeking the Companionship of the one whom He loves.

Points to ponder:
If you have not yet believed in Jesus and confessed of your sins, behold, Jesus is standing at the door of your heart, knocking. If you hear his voice, open your heart to him and he will come in to commune with you.
If you have believed in Jesus and are sanctified by his blood, Jesus is standing at the door of your heart, knocking. If you hear his voice, open your heart to him so that he can have the companionship that he is seeking.

Revelation 3:20 (KJV)
20 Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.

Song of Solomon 5:2 (KJV)
2
I sleep, but my heart waketh: it is the voice of my beloved that knocketh, saying, Open to me, my sister, my love, my dove, my undefiled: for my head is filled with dew, and my locks with the drops of the night.