Jude: This book is a letter from Jude to Christians, warning them that, after becoming Christian, one cannot have a "license for immorality" (i.e., do whatever we want and have no fear of any punishment from God). Other advice: "Keep yourselves in God's love as you wait for the mercy of our Lord Jesus Christ to bring you eternal life." (Jude 1:21)  "Be merciful to those who doubt...hating even the clothing stained by corrupted flesh." (Jude 1:23)