Donald S. Whitney, Spiritual Disciplines for the Christian Life, 1991, p. 106-107.
In response to two excuses why people do not evangelize: A Christian who has heard biblical preaching, participated in Bible studies, and has read the Scriptures and Christian literature for any time at all should have at least enough understanding of the basic message of Christianity to share it with someone else. Surely if we have understood the gospel well enough ourselves to be converted, we should know it well enough (even if as yet we know nothing else about the faith) to tell someone else how to be converted… Do we really want to say that we are too busy to fulfill the Great Commission of Jesus Christ to make disciples of unbelievers (Matthew 28:19-20)? Do we expect that at the Judgment Jesus will excuse us from the single most important responsibility He gave to us because we say, “I didn’t have time”?
Donald S. Whitney, Spiritual Disciplines for the Christian Life, 1991, p. 106-107.