I think that there are many things in the New Testament that show us that the godliness of our conversation plays an important evangelistic role. The apostles are clear that we mustn't limit the explicit sharing of the gospel to formal preaching. It can also happen in ordinary conversations.

The gospel of Christ has never needed the gimmicks of man to effect conversion in the soul

Today is what the Lord has prepared you for.

Membership is the church's corporate endorsement of a person's salvation.

Sometimes we have to wait a long time to see conversions.

If you are not offending people, then you are not an evangelist.

The difference between apologetics and evangelism is that in apologetics, you are answering objections that the world raises, whereas in evangelism, you are bringing the message that Christ brought. So unbelievers tend to set the agenda in apologetics, and you set the agenda in evangelism.