John 1:51

And He said to him, "Most assuredly, I say to you, hereafter you shall see heaven open, and the angels of God ascending and descending upon the Son of Man.'

meaning

Jesus is referring to Jacob's ladder, He is telling them that they like Jacob will experience supernatural events. Jesus has now replaced the ladder and is the mediator between God and man.

John 2:4

Jesus said to her, "Woman, what does your concern have to do with Me? My hour has not yet come.''

meaning

Jesus wanted His mother to recognize him as the Messiah and not the son she raised.

John 3:5

Jesus answered, "Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.

meaning

Water does not mean literal water, Speaks of a cleansing of the soul done by the Holy Spirit.

John 21:15

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.'' 16. He said to him again a second time, "Simon, son of Jonah, do you love Me?'' He said to Him, "Yes, Lord; You know that I love You.'' He said to him, "Tend My sheep.''
17. He said to him the third time, "Simon, son of Jonah, do you love Me?'' Peter was grieved because He said to him the third time, "Do you love Me?'' And he said to Him, "Lord, You know all things; You know that I love You.'' Jesus said to him, "Feed My sheep.

meaning

The meaning of John 21:15
When Jesus asked Peter if he loved Him, He used a word for love that signified total commitment. Peter responded with a word for love that signified his love for Jesus, but not necessarily his total commitment. This was not because he was reluctant to express that greater love, but because he had been disobedient and denied the Lord in the past. He was, perhaps, not reluctant to make a claim of Supreme devotion when, in the past, his life did not support such a claim. Jesus pressed home to Peter the need for unswerving devotion by repeatedly asking Peter if he loved Him supremely. The essential message here is that Jesus demands total commitment for His followers. Their love for Him must place Him above their love for all else. Jesus confronted Peter with love because He wanted Peter to lead the apostles (Matthew 16:18), but in order for Peter to be an effective shepherd, his overwhelming drive must exemplify supreme love for his Lord.  
More than these
This probable refers to the fish (v.12) representing Peter’s profession as a fisherman, for he had gone back to it while waiting or Jesus ( see v. 3). Jesus wanted Peter to love Him so supremely as to forsake all that He was familiar with and be exclusively devoted to being a fisher of men (Matthew. 4:19). The phrase may refer to the other disciples, since Peter had claimed he would be more devoted than all the others ( Matthew 26:33).