President Monson spoke in Priesthood Session to the great blessing of having a testimony and our responsibility to obtain and keep it. He said,

“There is absolutely nothing in this world that will provide more comfort and happiness than a testimony of the truth. Although to varying degrees, I believe every man or young man here tonight has a testimony. If you feel that you do not yet have the depth of testimony you would wish, I admonish you to work to achieve such a testimony. If it is strong and deep, labor to keep it that way. How blessed we are to have a knowledge of the truth.”

2012 October General Conference, See Others as They May Become, Priesthood Session – By Thomas S. Monson