LDS Church President Spencer W. Kimball said "Every young man should fill a mission". Young men between the ages of 19 and 25 who meet standards of worthiness are strongly encouraged to consider a two-year, full-time proselytizing mission. This expectation is based in part on the New Testament passage "Go ye therefore, and teach all nations..." (Matt. 28: 19-20). In 2007, approximately 30% of all 19-year-old LDS men became Mormon missionaries; from LDS families that are active in the church, approximately 80-90% of 19-year-old men serve a mission.