Speaking on chastity and morality, President Gordon B. Hinckley said,

You should recognize, you must recognize, that both experience and divine wisdom dictate virtue and moral cleanliness as the way that leads to strength of character, peace in the heart, and happiness in life. Will and Ariel Durant, who wrote eleven large volumes of history covering thousands of years, declared: “A youth boiling with hormones will wonder why he should not give full freedom to his sexual desires; and if he is unchecked by customs, morals, or laws, he may ruin his life before he matures sufficiently to understand that sex is a river of fire that must be banked and cooled by a hundred restraints if it is not to consume in chaos both the individual and the group” (The Lessons of History, New York: Simon and Schuster, 1968, pp. 35–36).

“Reverence and Morality”
April 1987 General Conference