'Last Sermon of Jesus'
John 16:19 Now Jesus knew that they desired to ask Him, and He said to them, "Are you inquiring among yourselves about what I said, 'A little while, and you will not see Me; and again a little while, and you will see Me'?
The moment our Lord Jesus realised that there were problems or differences within His disciples, immediately He will bring them out openly in order to remove further dissatisfaction.
Mat 20:24-25 And when the ten heard it, they were greatly displeased with the two brothers. But Jesus called them to Himself and said, "You know that the rulers of the Gentiles lord it over them, and those who are great exercise authority over them. Yet it shall not be so among you; but whoever desires to become great among you, let him be your servant."
The Lord silenced His disciples that the two brothers who wanted to be great sitting next to Him must first be servants to all and this applies to all of them. The people were amazed at His knowledge and wisdom to solve all their problems and disputes.
Mark 16:13-14 And they went and told it to the rest, but they did not believe them either. Later He appeared to the eleven as they sat at the table; and He rebuked their unbelief and hardness of heart, because they did not believe those who had seen Him after He had risen.
However, He was not able to make His disciples understand the need of His crucifixion and resurrection for their salvation because of their Unbelief caused by the hardness of heart for power, riches, positions, etc. All of them were like Thomas and they believed the gospel only after they had seen the resurrected Lord in front of them. Then they received the Holy Spirit of salvation and after that all of them went to Galilee as instructed by our Lord.
John 21:13-15 Jesus then came and took the bread and gave it to them, and likewise the fish. This is now the third time Jesus showed Himself to His disciples after He was raised from the dead. So when they had eaten breakfast, Jesus said to Simon Peter, "Simon, son of Jonah, do you love Me more than these?" He said to Him, "Yes, Lord; You know that I love You." He said to him, "Feed My lambs."
After our Lord was convinced of the love of Peter who denied Him 3 times, all His disciples were told to wait for the baptism of the Holy Spirit in Jerusalem. At Pentecost (Act 2) all His disciples who were filled with the Holy Spirit received the gifts of tongue thus drawing the attention of all the other Jews.
Devout Jews received the gifts of interpretations of tongue leading many to believe our Lord Jesus on hearing the gospel. All those disciples who loved Him were baptized by our Lord Jesus with the Holy Spirit. The Helper or Spirit of truth transformed them into the image of Jesus, filling them with His power, knowledge, wisdom, etc. and they glorified God in all their ways.
Brethren, we all need our Lord Jesus to baptize us with the Holy Spirit so that we can glorify the Lord by walking in the Spirit to overcome the deceitfulness of this world and the wiles of Satan. All we need to do is to keep His commandments by sincerely loving one another as He had loved us.