“It is the Holy Ghost that bears witness of your words when you teach and testify. It is the Holy Ghost that, as you speak in hostile venues, puts into your heart what you should say and fulfills the Lord’s promise that “you shall not be confounded before men” (D&C 100:5). It is the Holy Ghost that reveals how you may clear the next seemingly insurmountable hurdle. It is by the Holy Ghost in you that others may feel the pure love of Christ and receive strength to press forward. It is also the Holy Ghost, in His character as the Holy Spirit of Promise, that confirms the validity and efficacy of your covenants and seals God’s promises upon you.”

Source: “The Power of Covenants,” Ensign, May 2009, p. 22