If your dad says, "Go clean your room," he generally means it, right?
It would be a little different if your dad said, "Now, Susie, if you want to, would you go clean your room, please?" In that case you would have a choice. But if he simply says, "Go and do it," you don't have a choice. It would be an order.
Jesus told His disciples to "Go into all the world and preach the gospel to every creature." He did not say, "Now, Peter, if you've got the time, would you mind going and preaching the gospel?"
He didn't say, "Now, Mary, if you're having a good hair day, could you possibly squeeze in some time to tell other people about me?" That's not how He said it. He simply said, "Go!" It was an order - a command. He didn't give us a choice.
Back in the Old Testament, God gave Moses a set of rules that we call the Ten Commandments. In them, He said things like, "Don't steal. Don't murder any one. Don't gossip about your neighbors." He didn't give us a choice. That's why we call them commandments.
Jesus feels the same way about us telling other people about Him. He feels very strongly about it. If you're His disciple, He expects you to spread the good news.
When we win other people to Him, He expects us to teach them this same commandment, so that all of His people are continuously telling others about Jesus.
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