If you can't see that the first parable is talking to the crowd and the second to future church leaders then I can't say much more. Haven't you noticed that the first parable talks about servants (plural) while the second talks about a servant (singular)?
I think we will only go in circles so I will leave it at that.
The parable states in (Luke 12:37), " Blessed are those servants, whom the lord when he cometh shall find watching: verily I say unto you, that he shall gird himself, and make them to sit down to meat, and will come forth and serve them.
Peter asked, (Luke 12:41), "...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, who his lord shall make ruler over his household, to give them their portion of meat in due season?"
Jesus in (12:42) is identifying who the fatihful servants are in (12:37), due to Peter's question. This is easily seen as in the parable (12:37) and in the explanation, (12:42), both are sat down to be given food.
The same parable is given in (Matt. 24:42-51) which as I showed, occurs after the Tribulation. (24:29) The Church is already gone. The parable speaks to those believers who are alive during the Tribulation and waiting for the Lords return to set up the kingdom. And then the Lord appoints or rewards those based on their actions and watchfullness. This reward is not an entrance into heaven. It is a place within the millennial kingdom. As unbelievers will be in the kingdom, these servants of God who have not been watchful, will have their place with the unbelievers.
This parable does not teach that a Christian can lose their salvation. We can certainly apply it to us in that it shows the importance of remaining faithful and watching our conduct knowing that the Lord sees it all. And, that we too have a judgement of rewards to attend. (1 Cor. 3:11-15)
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