The Lord didn't send his disciples out solo. He sent them out in pairs. Pairs were more than twice as effective as a single person in accomplishing the work of preparing people's hearts for the Kingdom of God and the good news about Jesus. Several Jewish principles were behind this. First, testimony needed to be at the hands of two or three witnesses. Second, two are stronger and more effective than one. To this, Jesus adds a third principle of his own: where two or three gather, there he is present. No matter how strong we are, we need a partner. Even the incredibly committed apostle Paul needed his co-workers and friends (see 2 Timothy). We need each other to do God's work and accomplish God's mission. Don't try to do it solo!