That is all well and good, but you are misusing the text. When you read the passage in context, you will see that Jesus is attempting to show the apostles that they are not to Lord their position over others.
The complete passage is as follows:
And they came to Caperna-um; and when he was in the house he asked them, “What were you discussing on the way?” But they were silent; for on the way they had discussed with one another who was the greatest. And he sat down and called the twelve; and he said to them, “If any one would be first, he must be last of all and servant of all.” And he took a child, and put him in the midst of them; and taking him in his arms, he said to them, “Whoever receives one such child in my name receives me; and whoever receives me, receives not me but him who sent me.” John said to him, “Teacher, we saw a man casting out demons in your name, and we forbade him, because he was not following us.” But Jesus said, “Do not forbid him; for no one who does a mighty work in my name will be able soon after to speak evil of me. For he that is not against us is for us.”
Likewise Jesus has this to say as well:
He who is not with me is against me, and he who does not gather with me scatters.
If someone does not gather with the Church established by Jesus, which is his body, he will scatter.
The answers given to you are good, and you should give them careful thought and reflection.
I hope this helps at least a little.