Rev 3:20

“On the other hand, God may permit us also to be kings of the earth, "kings of earth" in order to rule over our own flesh. In this connection the apostle says, "Therefore do not let sin reign in your mortal body." In another part of Scripture it is written, "The king's heart is in the hand of God." … The kings, therefore, are the saints, and their hearts are in the hand of the Lord. Let us beg God to make us kings that we may rule over our flesh that it be subject to us. The following words of the apostle are appropriate here: "But I chastise my body and bring it into subjection, lest perhaps after preaching to others, I myself should be rejected." May our soul be in command, our body in subjection; then Christ will come at once to make his abode with us. What does he himself say in the New Testament? "Behold, I stand at the door and knock. If any man listens to my voice and opens the door to me, I will come in to him and will sup with him." Every day, Christ stands at the door of our hearts. He longs to enter. Let us open wide our hearts to him. Then he will come in and be our host and guest. He will live in us and eat with us.”

“If an earthly king or the head of a family invited you to his birthday celebration, with what kind of garments would you endeavor to adorn yourself when you approached? Surely with new and shining ones, costly ones, whose age or cheapness or ugliness could not offend the eyes of the one who invited you. Therefore, with Christ's help, strive as much as you can with a like zeal, so that your soul may with an easy conscience approach the solemn feast of the eternal king, that is, the birthday of our Lord and Savior, if it is adorned with the decoration of various virtues. Let it be adorned with the jewels of simplicity and the flowers of temperance, gleaming chastity, shining charity and joyful almsgiving. For if Christ the Lord recognizes that you are celebrating his birthday with such dispositions, he himself will deign to come and not only visit your soul but also rest and continually dwell in it. As it is written, "I will dwell with them and walk among them"; and again, "Here I stand, knocking at the door; if anyone rises up and opens the door, I will enter his house and have supper with him, and he with me." How happy is the soul which, with God's help, has striven to direct his life in such a way that he may merit receiving Christ as his guest and indwelling person.”

“The Lord stands at the doorway and knocks when he pours into our heart the memory of his will, either through the mouth of a man who is teaching [us] or through his own internal inspiration. When his voice is heard, we open the gate to receive [him] when we willingly present our assent to [his] counsels, whether secret or open, and devote ourselves to accomplishing those things that we recognize are to be done. He comes in order to eat with us and we with him. For he dwells in the hearts of his elect through the grace of his love in order to restore them always by the light of his presence. He lives there so that they may advance more and more to heavenly desires, and so that he himself may feed their zeal for heaven, as it were, with a most pleasing banquet.”

“Behold, I stand at the gate, and knock. If any man shall hear my voice, and open to me the door, I will come in to him, and will sup with him, and he with me. This is not to be taken as a physical act of standing, but as a placeless one, because when the Lord dwells in someone, he does not leave him to pass to someone else. The gate signifies the mind's entrance, which the Lord knocks at on his own, with no companion, by inspiring: his voice is heard by whoever keeps the advice of his commandments out of love, and this person opens the door when he broadens his heart to see the highest good of eternity. Finally, when the door has been opened, the Lord comes in to him, because he illuminates through inner sweetness the soul burning with desire. So the Head sups..... because by doing the Father's will every day..... the limbs..... 5 with the Head, the limbs which die with him every day in order to do the Father's will, as in for you are dead, etc. [Col. 3:3]”

“Behold, it says, I stand at the door and knock; if anyone hears my voice and opens the door, I will come in to him and dine with him, and he with me. The Lord demonstrates to His own as the gentle and peaceful One. For the Devil strikes with "an axe and a chisel" the doors of those who do not receive him, according to the voice of the prophet (Ps. 73:6). But the Lord even now, and in the Songs, says to the bride, "Open to me, my sister, my bride." (Song 5:2) And if anyone opens to Him, He enters. The supper with the Lord, which signifies the participation in the holy mysteries, is hinted at.”