Brethren! In order to believe in our Lord Jesus Christ repentance is needed; in order to remain in this salvific faith, repentance is needed; in order to be successful in it, repentance is needed; in order to inherit the Kingdom of Heaven, repentance is needed.
All of this is clearly set forth in the Holy Scripture. Holy Scripture teaches us that “God sent His Son into the world … that the world through Him might be saved,” that “he that believeth on Him is not condemned; but he that believeth not is condemned already,.“ “That light (Christ) is come into the world, and men loved darkness rather than light, because their deeds were evil. For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.” (John 3: 17-20) To those afflicted by the passion of vainglory the Scripture witnesses: “How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only?”(John 5:44). Those bound by the passion of greed did not only not believe the Lord, but they even derided Him when He preached to them the important and most holy teaching concerning the remembrance of eternity, and the arranging of earthly matters in accordance to the immortality appointed for man. (Luke 16: 14) Those attracted to the evil passion of envy did not only not believe in the Lord, but they also conspired to kill Him, and they accomplished this. All those infected with vain and sinful vices, according to the unerring testimony of the Gospel, are cut of from participating in the spiritual wedding of the Son of God, making themselves unworthy of blessed union with Him (Matt. 22:5). “You can not serve God and Mammon!” (Luke 16:14); you cannot serve two masters, God and sin! “Repent: for the Kingdom of Heaven is at hand! Repent, and believe in the Gospel (Mark 1:15).
However, one who has believed in Christ, and has decided to continually prove his faith, by his actions, is also in need of repentance. What do you think, brethren; what is the first fruit of living faith? What is the first fruit of fulfilling the commandments of Christ? I will give you the answer of St. Simeon the New Theologian, who acquired his knowledge of truth through his holy experience. He said: “The careful fulfillment of the commandments of Christ teaches a man his own infirmities.” Exactly! As soon as one who believes in Christ begins to fulfill the all-holy commandments of the Gospel, or also, to perform the works of renewed nature, his fallen nature is instantly revealed to him, which had been hidden from sight until then, and it enters into a sustained battle with the Gospel. The life of one who struggles for Christ is filled with unseen falls. He involuntarily confesses with the Apostle: ”For I delight in the law of God after the inward man: But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. O wretched man that I am!” (Acts 7: 22-24). From such an observation of oneself, blessed poverty of spirit is engendered within a Christian, rational, spiritual mourning appears, and a broken and humble heart is established, which God will not destroy (Ps. 50: 20). In living according to the Gospel, there appears in a man, as if naturally, the repentance commanded by the Gospel. Therefore, repentance is necessary not only in order to believe in Christ; it is necessary in order to have a living faith in Christ. “Repent for the Kingdom of Heaven is at hand.”
There remains to be explained: why is there such a close connection between the words of the Lord calling us to repent, and the announcing of the nearness of the Kingdom of heaven? Why is there not presented between them a kind of intermediate struggle, an intermediate condition? The reason is that our Lord Jesus Christ is “the Lamb of God which taketh away the sin of the world” (John 1:29) — He has accomplished everything for our salvation. He has reconciled us with God; He has prepared and acquired for us the Heavenly Kingdom. We, mankind, have been presented with one work in the matter of our salvation: the work of accepting salvation, given to us by God free and complete, the work of repentance. The Heavenly Kingdom and the Heavenly King are ineffably close to us — incomparably closer than we imagine. “Behold, I stand at the door” of the heart of man, exclaims this King, and I knock at it with My all-holy and almighty Word: “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 (Rev. 3:20). The opening of the doors of the heart to the Heavenly King is accomplished—with repentance. “Repent for the Kingdom of Heaven is at hand.”