As a vital link in the conversion process, we should bear our testimonies that the gospel is true; our testimonies may well be the spark that ignites the conversion process. Consequently, we have a double responsibility: we must testify of the things we know, feel, and have felt, and we must live so the Holy Ghost can be with us and convey our words in power to the heart of the investigator.

The Teachings of Spencer W. Kimball, Twelfth President of the Church of Jesus Christ of Latter-day Saints (ed. 1982)