The seventy-two disciples returned rejoicing and said to Jesus, “Lord, even the demons are subject to us because of your name.” Jesus said, “I have observed Satan fall like lightning from the sky.
Behold, I have given you the power ‘to tread upon serpents' and scorpions and upon the full force of the enemy and nothing will harm you. Nevertheless, do not rejoice because the spirits are subject to you, but rejoice because your names are written in heaven.”
At that very moment he rejoiced in the Holy Spirit and said, “I give you praise, Father, Lord of heaven and earth, for although you have hidden these things from the wise and the learned you have revealed them to the childlike. Yes, Father, such has been your gracious will. All things have been handed over to me by my Father. No one knows who the Son is except the Father, and who the Father is except the Son and anyone to whom the Son wishes to reveal him.”
Turning to the disciples in private he said, “Blessed are the eyes that see what you see. For I say to you, many prophets and kings desired to see what you see, but did not see it, and to hear what you hear, but did not hear it.”
Jesus appointed seventy-two disciples whom He sent in pairs to visit and preach in towns and places. They all came back rejoicing because they witnessed they can do great things in His name, and even the demons are subject to them. Indeed, those who are sent by Jesus are given His power, but Jesus reminded them not to rejoice because the spirits are subject to them, because the real joy and grace is that they're chosen to enter the kingdom of heaven.
Rejoicing in the Holy Spirit, Jesus also revealed to His disciples the mystery between Him and His Heavenly Father: “No one knows who the Son is except the Father, and who the Father is except the Son and anyone to whom the Son wishes to reveal him.” Therefore, to know and believe in the Father and the Son is a grace from above, though it also depends on our response. Notice that even to this day, where the gospel is almost preached throughout the world, many people still fail to see that Jesus is the Son of God and He is our savior. So those who accepted the gift of faith to see this mystery of God should always be thankful, and like Jesus, always give our Heavenly Father thanks and praise.