Jesus is giving his great and heartfelt farewell discourses to his apostles. He assures them, among other things, that they will see him again, because he will reveal himself to those who love him.
Then Judas (not Iscariot) asks him why he intends to reveal himself only to them and not publicly. The disciple was hoping for a huge outward manifestation of Jesus, one that could change the course of history and that, in his view, would be more effective in saving the world. In fact, the apostles all thought Jesus was the long-awaited prophet of the last days who would reveal himself to everyone as the King of Israel, who when he came would put himself at the head of the people of God and establish the kingdom of the Lord once and for all.
Jesus explains that instead, his revelation will not take place in a spectacular and outer way. It will be a simple but extraordinary ‘coming’ of the Trinity into the heart of the faithful person, occurring wherever there is faith and love.