According to St. Victorinus, the removal means to disperse the congregation: “And thou hast left thy first love: remember whence thou hast fallen.” He who falls, falls from a height: therefore He said whence: because, even to the very last, works of love must be practiced; and this is the principal commandment. Finally, unless this is done, He threatened to remove their candlestick out of its place, that is, to disperse the congregation. [St. Victorinus Commentary on the Apocalypse] 304AD
**According to Oecumenius, the removal means Christ abandonment: **By the removal of the candlestick, that is, the church, he means his abandonment of it, as a result of which sinners become involved in every kind of disturbance and tumult, so that they say, “My eye was troubled in my soul, and my heart was troubled within me. (Ps. 30:10)” [Oecumenius Commentary of Revelation] 6th Century
Penance is needed from the redeemed: And indeed, writing to the seven churches, rebuking each one of them with its own crimes and sins, it said, “Do penance.” To whom but to them, doubtless, whom He had redeemed at the great price of His blood? [A Treatise Against the Heretic Novatian by an Anonymous Bishop Verse 13] 240AD
**Apringius explains that penance is needed to cleanse us from sin: **For although He wishes that we remember those instances in which we have badly fallen, He exhorts that we might not fall again. And that our faults which we have committed might be cleansed, He shows a way by which one might come to pardon when He says, “Do penance.” That is, wash away your sins with tears, just as, “that sinful woman,” as a type of the Church, “washed the feet of Jesus with he trears and wiped them with her hair.(Lk. 7:44)” And He exhorts and commands what one should do after penance: “Do your first works,” either by an extraordinary goodness or do those works which you had done in the earnestness of your first conversion. [Apringius of Beja Commentary on Revelation] 6th Century
St. Cyprian points out that penance is necessary for the baptized: This is certainly said to him who, it is ascertained, has fallen and whom since is it written, “Alms deliver…from death.(Tobit 4:11)” Certainly not from that death which once the blood of Christ extinguished and from which the water of beneficial baptism and the grace of our Redeemer freed us, but from that which afterward creeps in through sins after baptism. The Lord certainly would not exhort to repentance if it were not because He promises pardon to the penitent. [St. Cyprian Letter 55.22] 248AD
Penance is a righteous work: Laying aside all rash haste, they should manifest a religious patience to God, so that when by His mercy we come together, we may debate upon all kinds of things, according to the discipline of the Church, especially since it is written, “Remember from whence thou hast fallen, and repent.” Now he repents, who, remembering the divine precept, with meekness and patience, and obeying the priests of God, deserves well of the Lord by his obedience and his righteous works. [St. Cyprian Epistle 13] 248AD
St. Andrew says that the removal of the lampstand is being deprived from divine grace: "The removal of the candlestick of the Church is the deprivation of Divine Grace, to which she will be subjected in agitation and shaking from the spirits of malice and the evil men who help them.” [St. Andrew of Caesarea] 6th Century
St. Caesarius points out that the lampstand is moved, not taken away: Note that He did not say He ‘takes away’ the lampstand but that He ‘moves.’ For the lampstand signifies the one Christian people. Therefore, He says that this lampstand is to be moved, not taken away, so that we might understand that in the very same Church the evil are moved and the good confirmed. Moreover, He means that by the hidden but nonetheless just judgment of God, that which is taken from the evil is given as increase to the good. This fulfills that which is written, “He who has, it will be added to him, but to him who has not, even that which he has shall be taken from him.(Mt. 25:29)” [St. Caesarius of Arles Commentary on Revelation] 470-543AD