Peter must especially be troubled at this point, though the rest of the disciples must be too. They have just realized that their Master is about to leave them as He said, "though canst follow me now" (John 13:36). These and the following words are Jesus preparing His disciples for their life without the physical presence of the Saviour. Worse for Peter, he has been told that he will deny his Lord three times before even the end of that night. Surely the Lord will cut Peter off? Perhaps some of the other disciples, who did not understand that Judas had gone to betray the Lord (John 13:28-29) but knew one of them would, were about to blame Peter as the son of perdition. Would the Lord cut off Peter? No, "he loved them to the uttermost" (John 13:1). Peter would deny. All would be scattered. Only John is recorded as being right to the cross. Yet their hearts should not be troubled because He is going to prepare their room in the house of His Father, in spite of all that would occur that night.
We can take comfort that in spite of where we are in our experience. At times, and maybe always, we feel that we are falling short of where God would have intended us for us to be in our lives. Maybe we feel guilty because our prayer life is irregular, our study time is short, and our meditation time doesn't exist. Now's the best time to get on the right track. Despite how far we feel that we've fallen short, we are all on level footing before God because of our salvation being by grace. We are sons of the Father.
Let us not let our hearts be troubled. Live for Christ as the disciples ended up doing. They all died a martyr's death, except John who lived a martyr's life. Let us not let our hearts be troubled, He has gone to prepare a place for us in the house of His Father and He is coming again based on His work and not on ours.
