Have you ever considered yourself part of a ministry? If so, who were you trying to reach? What was your target group? Did you receive the opportunity to share the Gospel with someone outside of that group? If so, did you?
These may seem like strange questions, but they are important ones to ask. Paul was on trial, and was testifying to the fact that he had preached the Gospel to "both Jews and Greeks". This holds special importance if we realize that Paul was sent as a missionary to the Gentiles, or those who were not Jewish.
Paul points out, however, that he did not just testify to the Greeks, who would fall under the category of Gentiles. Rather, Paul testified to Jews when the opportunity presented itself. We need to have a similar attitude whenever we spread the Gospel.
Whenever we spread the Word, we may have a particular audience in mind to which we wish to preach. However, if there is an opportunity to speak to someone outside of this audience about Jesus, we must take that opportunity. This means that if we wish to share the Gospel with the poor, we must be ready to share the same message with someone who is wealthy. If we wish to share the Gospel with one people group (Group A), we must be willing to share the same Gospel, the Gospel of Christ, with another people group (Group B). Everyone needs Jesus, and I may be the only one from whom this person hears the Gospel.