The Seventy returned from their mission rejoicing in the Lord, and their experiences far exceeded their expectations. They told Jesus that even the demons were subject to them through his name. Indeed, we are engaged in a great spiritual battle. It is the battle of the great day of God Almighty (Revelation.16:14). It is a battle of authority. All authority in heaven and earth has been given to Jesus (Luke 10:22; cf. Matthew 28:18), and he gives this authority to us (Luke 10:18-19; cf. Matthew 28:18-20;). Satan had fallen when Jesus first sent laborers out into the fields to bring in a harvest, and his authority continues to crumble at the preaching of the Gospel of the Kingdom of God. Satan fell, when he first began to lose ground to God. Jesus and his servants fought and Satan and his servants (religious leaders and heads of state) fought (Revelation 12:7-9). Satan began losing the hearts of men at that time and continues to lose today.
It is significant that we find Jesus rejoicing in this Scripture (Luke 10:21-22). Some Scriptures can be read over and over again without one picking up on what is being said. I know I’ve read this Scripture many times, yet it never occurred to me that this is the one and only time Jesus is recorded to have rejoiced. How important, then, this must have been! The Seventy were sent out to face the enemy in a war begun during the days of Jesus’ public ministry. This war continues to this day, but the battles we wage cannot be seen in the outer realm. Rather, the battle is within man.
Look back at what Jesus told the Twelve approximately nine months previous to his sending out the Seventy (Luke 9:1-10). In verse-6 of Luke 9 the Apostles departed and went through the towns. What towns? According to Matthew 10:5, Jesus sent out the Twelve and commanded them, saying, “Go not into the way of the gentiles, and into any city of the Samaritans enter ye not.” However, the Seventy were given no such command. In fact, Jesus had been at the time of sending out the Seventy passing through parts of Samaria on his way to Jerusalem (Luke 9:52). Some of the villages where the Seventy ministered had to have been in Samaria. My point is this: the Twelve planted seed, but the seed spread to places where they had not been. Scripture reveals that the word of God cannot be contained. The message of the Gospel cannot be held inside one national or provincial border or kept out by another border. The Gospel is spiritual and, as a locked door couldn’t keep Jesus out (John 20:19, 26), neither can anything in this world keep the Gospel from spreading. The word of God cannot be contained.
Jesus rejoiced in that the Seventy were reaping what the Twelve labored to plant. They entered into their labors and harvested a crop for the Kingdom of God. Each heart gained was ground lost by the enemy. Satan fell at the preaching of the Gospel (Luke 10:18; Revelation 12:7-9). Mankind is simply unable to stop what was begun here. He may steal, kill and destroy (John 10:10), but he can do no harm to the Gospel or to those who preach it (Luke 10:19), because:
“No weapon that is formed against thee shall prosper; and every tongue that shall rise against thee in judgment thou shalt condemn. This is the heritage of the servants of the LORD, and their righteousness is of Me,” saith the LORD (Isaiah 54:17).
The weapons used against us are physical and worldly, meant to hurt or kill our bodies. This, however, cannot keep us from our destiny with the Lord. Our weapons, on the other hand, are spiritual and mighty through the power of God, destroying strongholds of men’s imaginations. Our power or authority is not directly over the outer realm, but is directed at the inner man whose efforts reach out against the truth of God. We bring men’s minds captive to Christ (2Corinthians 10:3-5). Therefore society and nations are changed. No army devised of men can stand up to the weapons within our power (1Corinthians 4:20; Isaiah 54:17; cf. Acts 28:16; Philippians 4:22). No kingdom can stand before us, and no national border can keep the Gospel away nor contain it within. Praise be to Almighty God!
 Jesus had earlier shown that the ground into which the seed is sown is like the human heart into which God sows his word (Luke 8:8, 15).