There are those Christians who do not want to preach the Gospel verbally. They say: I preach by living a life of good example. There has been always something wrong about this notion, however, the best critic I've heard is this:
Other than Christ, no one is not perfect. So how can you by your good living example amount to anything worthy of the Gospel? You may win over some friends and strangers by default, with pretense or not, but you certainly cannot win someone who knows you well in your family or circle of relatives over to the Gospel.
Source: Pastor Mike Abendroth on "Evangelical White Lies" on Janet Mefferd's Show 9/2/16.