Testimonies are great things about what the Lord has done for us, but no-one will be offended when you talk about what God has done for you. You need to be specific about sin, about Christ's death on the cross, about others' need for a saviour, and about their need to repent and trust in Christ.
Mark DeverEvery believer should evangelize. I know some Christians think that evangelism is only for people with special gifts for it, but I don't believe the New Testament teaches that. While Paul does say that some believers have the call to be evangelists, all of us have the responsibility of evangelism.
Mark DeverI want to defend the right of employees to share the gospel in appropriate situations. Every situation requires wisdom and insight. I don't think it's wise to say, "Share the gospel every time you can". I can see all kinds of problems that come from that approach.
Mark Dever