How does God want Christians to profit concerning evangelism from Acts 22:14-15?

 Acts 22:14 And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth. 15 For thou shalt be his witness unto all men of what thou hast seen and heard.

This passage reveals what God directed Ananias to say to Paul when Paul was brought to Damascus after his encounter with the risen, glorified Jesus. Based on what Ananias said to Paul, what do we learn about how God wants Christians to profit concerning evangelism from this revelation?

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