Without the Holy Ghost we can't comprehend the purpose of life

"Without this glorious gift [of the Holy Ghost] we cannot comprehend the purpose of life or the great plan of the Eternal Father."

- Elder Kenneth Johnson, Of the First Quorum of the Seventy, "Yielding to the Enticings of the Holy Spirit," General Conference, Oct 2002
http://www.lds.org/general-conference/2002/10/yielding-to-the-enticings-of-the-holy-spirit?lang=eng

Conversion is to do and to become

“Testimony is to know and to feel, conversion is to do and to become.”

- Elder Dallin H. Oaks, Quorum of the Twelve Apostles, as quoted by Elder Kenneth Johnson of the Seventy in “Coming to Know for Ourselves,” Ensign, Jul 2008

http://www.lds.org/ensign/2008/07/coming-to-know-for-ourselves?lang=eng