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The gospel is not habit, but history. The gospel is the declaration of something that actually happened. And since the gospel is the saving work of Jesus, it isn’t something we can do, but it is something we must announce. We do live out its implications, but if we are to make the gospel known, we will do so through words.

It's pretty clear that the Gospel is something that is preached:

As Scripture says, “Anyone who believes in him will never be put to shame.” For there is no difference between Jew and Gentile—the same Lord is Lord of all and richly blesses all who call on him, for, “Everyone who calls on the name of the Lord will be saved.” How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? And how can anyone preach unless they are sent? As it is written: “How beautiful are the feet of those who bring good news!". But not all the Israelites accepted the good news. For Isaiah says, “Lord, who has believed our message?” Consequently, faith comes from hearing the message, and the message is heard through the word about Christ. (Romans 10:11-17)

We are saved by faith and that faith effects a spiritual change within the heart of every believer. Consequently, our lives should show the evidence of that intrinsic change and others are attracted to Christ when they see how we live to the glory of God. The idea that we live our faith so that others praise God - and not us - is the reason why, I think, He left us here rather than immediately taking us up once we are born again. We work with the Holy Spirit to call the unsaved to Christ. This should be a strong reminder to us that we have a responsibility to the world to not only preach the Gospel to everyone but to live the Gospel, too.