And he called to him his twelve disciples and gave them authority over unclean spirits, to cast them out, and to heal every disease and every affliction... These twelve Jesus sent out... (Mt 10:1,5a)
In Matthew 10 it is very clear that Jesus calls his disciples in order to send them out. Jesus did not do all the preaching and demonstrating of the kingdom himself - he equipped others to do the same. He still does. Our calling includes both an equipping and a commission, just as it did for that first twelve.
We are not called to form a nice cosy Christian huddle, away from the big bad world, waiting for heaven. We are called by Jesus to be sent back with his authority to bring the kingdom to where we are.
One interesting detail I noted, is that in Matthew even the list of the disciples names indicates this purpose. They are paired up two by two, just as Jesus sent his disciples out two by two. Jesus strategy is to call us in, join us together, then send us out.