Similar Material w61 2/1 p. 93 Safeguard Thinking Ability for the Ministry Safeguard Your Thinking Ability The Watchtower Announcing Jehovah’s Kingdom—1960 Knowledge Aid to Bible Understanding Thinking Ability Aid to Bible Understanding Thinking Ability Insight on the Scriptures, Volume 2 Knowledge Insight on the Scriptures, Volume 2 How Can Thinking Ability Safeguard You? The Watchtower Announcing Jehovah’s Kingdom—2002 Think Straight—Act Wisely The Watchtower Announcing Jehovah’s Kingdom—2003 Exercising Maturity—A Safeguard The Watchtower Announcing Jehovah’s Kingdom—1966 Who Molds Your Thinking? The Watchtower Announcing Jehovah’s Kingdom (Study)—2018 A Personal Gift from Jehovah The Watchtower Announcing Jehovah’s Kingdom—1974