From; Ellen G White.
The seal of God will never be placed upon the forehead of an impure man or woman. It will never be placed upon the forehead of the ambitious, world-loving man or woman. It will never be placed upon the forehead of men or women of false tongues or deceitful hearts. All who receive the seal must be without spot before God—candidates for heaven.—Testimonies for the Church 5:216 (1882). – {LDE 221.3}