In his “farewell discourse” Jesus speaks to the Disciples as “Little Children” because they are young in their faith. Jesus is still trying to prepare the Disciples for his departure. He is repeating he will be leaving them soon and they cannot go with him. He gives them a “new” commandment that they are to love each other in the way he has loved them; with the love of God. Others will see how you live and love. While you cannot follow him right now, you will one day follow. Live life to the fullest showing the love of God to everyone in your path. Jesus tells how He is preparing a place for them when they do follow him. Heaven is big enough for everyone who believes.
Believe in Heaven.
Believe in God.
Believe in Jesus.
Jesus is the Way, the Truth, and the Life. No-one comes to the Father but through Jesus.