Luke 12:41 Then Peter said unto him, Lord, speakest thou this parable unto us, or even to all?
Luke 12:42 And the Lord said, Who then is that faithful and wise steward, whom his lord shall make ruler over his household, to give them their portion of meat in due season?
Luke 12:43 Blessed is that servant, whom his lord when he cometh shall find so doing.
The faithful servant shall be blessed and will be rewarded.
Luke 12:44 Of a truth I say unto you, that he will make him ruler over all that he hath.
In the millennium, he will be a king and or a priest.
Luke 12:45 But and if that servant say in his heart, My lord delayeth his coming; and shall begin to beat the menservants and maidens, and to eat and drink, and to be drunken;
Luke 12:46 The lord of that servant will come in a day when he looketh not for him, and at an hour when he is not aware, and will cut him in sunder, and will appoint him his portion with the unbelievers.
The unfaithful servant will be cut off and placed with the unbelievers to be judged at the second resurrection.
Luke 12:47 And that servant, which knew his lord's will, and prepared not himself, neither did according to his will, shall be beaten with many stripes.
The unfaithful servant who knew God's will, will have a more severe punishment.
Luke 12:48 But he that knew not, and did commit things worthy of stripes, shall be beaten with few stripes. For unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more.
The servant who knew not the will of the Lord and who sinned, will not receive as great a punishment. They both are judged by what they knew and what they were given from God and what they did. The Lord is a just judge and no sin may enter heaven. Those not in heaven will be judged according to a righteous judgment. The most severe judgment would be as for satan, to be cast into the lake of fire to be tormented forever.
Luke 12:49 I am come to send fire on the earth; and what will I, if it be already kindled?
The fire of his judgment; for his word shall judge the nations, but first he will judge individuals and the church as to sins needing to be repented of. John the Baptist spoke:
Mat 3:11 I indeed baptize you with water unto repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire:
Mat 3:12 Whose fan is in his hand, and he will thoroughly purge his floor, and gather his wheat into the garner; but he will burn up the chaff with unquenchable fire.
Chaff, can refer to that which is not of God, including unrepentant sinners. He also will prepare his church, his bride, to purify her.
1 Pet 4:17 For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God?
1 Pet 4:18 And if the righteous scarcely be saved, where shall the ungodly and the sinner appear?
1 Pet 4:19 Wherefore let them that suffer according to the will of God commit the keeping of their souls to him in well doing, as unto a faithful Creator.
Luke 12:50 But I have a baptism to be baptized with; and how am I straitened till it be accomplished!
Baptism is to be immersed, he would be immersed in the thing which he is compelled to finish. Baptism for us is symbolic of what he was about to accomplish for us. He was to shed his blood on the cross for the remission of our sins. He was to be buried in the cave tomb, and he would arise from the grave. This was the baptism that he was to accomplish for us so that we may be identified with him as children of God. By receiving Jesus by faith we are kept from the eternal fire of God's judgment for sins. We are baptized with him and receive the Holy Ghost, His seal on us until we are with him.