Luke 10:3 Go your ways: behold, I send you forth as lambs among wolves.
They were sent forth by the good shepherd as lambs among wolves. Sheep are not very bright, lambs are weak and defenseless, unable by there natural abilities to survive in the world. What is out in the world? wolves. A wolf will follow a sheepfold and pick off the stragglers or the weak ones away from the fold. What is Jesus saying? In themselves they are weak, not so smart, totally unable to survive in a world of wolves. A wolf is symbolic of a bad spirit, a worker for the devil. The world is full of people serving the devil. Where is the Shepherd of the sheep? Where is their help?
Jesus sent them; they believed in the power and authority of the name of Jesus. They went forth as ambassadors representing the king of kings and Lord of lords. As Peter, they had authority because they knew Jesus as the Messiah, the Christ. Who he sends he equips with his grace through the Holy Spirit. They could do nothing without this power. The Spirit at this time was given for service, but the Spirit could leave afterwards. After Pentecost, the Holy Spirit stays with us, He is the seal, of ownership, a seal that we belong to God. They were to go forth in the power of God, not in their own strength. Jesus gave them a job to do, he would supply what is needed. This is true for us as well. If we are called to do something, we do it by His supplied power, through the Holy Ghost.