Saint Francis of Assisi is reported to have said, “Preach the gospel at all times. If necessary, use words.”
First of all, it is doubtful whether he actually said this. Second, I understand the heart behind the sentiment. Our lives need to match our message before we think we have any credibility to speak with others. I very much agree with this.
However, words are always necessary. Paul asks three simple questions: “How then will they call on Him in whom they have not believed? How will they believe in Him whom they have not heard? And how will they hear without a preacher?” (Romans 10:14). People need to hear the gospel. Seeing is not enough.