The gospel is a set of propositions that can only be explained by words. We must preach the gospel. Our lives are not the gospel. By living a Godly life, someone may be drawn to inquire as to what makes you different or something like this. However, when this happens, then you share the gospel with them. Our lives may lead to the preaching of the gospel but they are not the gospel.
The gospel does not come simply in words. Consider the following.
“For our gospel did not come to you merely in words, but in power and in the Holy Spirit and with full conviction. You know how we lived among you for your sake. You became imitators of us and of the Lord" (1 Thess. 1:5,6).
1 Peter 3:1: “Wives, in the same way be submissive to your husbands so that, if any of them do not believe the word, they may be won over without words by the behavior of their wives, when they see the purity and reverence of your lives.â€
Titus 2:9-10: “Teach slaves to be subject to their masters in everything, to try to please them, not to talk back to them, and not to steal from them, but to show that they can be fully trusted, so that in every way they will make the teaching about God our Savior attractive."
"I would suggest that our actions, insofar as they are the fruit of applying the gospel’s truth to the various facets of our lives, serve to testify to and commend that truth. In other words, while they may not communicate the full gospel explicitly, they will in various ways provide (by God’s grace) evidence that the gospel is true, powerful, and desirable. This, it would seem to me, is integral to the task of communicating the gospel. So while preaching the gospel will at some point always involve more than living in a manner consistent with it, it should never involve less." http://www.everysquareinch.net/2009/05/c...words.html