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Pray earnestly and fast with purpose and devotion. Some difficulties, like devils, do not come out save by fasting and by prayer. Ask in righteousness and you shall receive. Knock with conviction and it shall be opened unto you.

Jeffrey R. Holland (1985). “However Long and Hard the Road”, Deseret Book Co
Pray earnestly and fast with purpose and devotion. Some difficulties, like devils, do not come out save by fasting and by prayer. Ask in righteousness and you shall receive. Knock with conviction and it shall be opened