Because we are surrounded by many different people each day, we should learn how to start a conversation. A conversation may develop on the signs of the times and the return of Jesus as the solution. You may then have the opportunity to give your testimony about how knowing Jesus has helped you. The verbs witness and testify are intimately related. So he witnessed both to the necessity of repentance and to the power of God to transform the repentant one.
Experience lies at the foundation of all true, effective witnessing.
No man has any right to recommend to others what he has not himself tasted and tested. Some people need something to tell more than they need power to tell it. Too often we preach of things in which we have no personal experience. To these lowly ones, as well as to the disciples who had been with the Savior during His earthly ministry, had been given a precious trust. They were to carry to the world the glad tidings of salvation through Christ.