"Sufism has always had the function of purifying Islamic ethics and that fasting and tazkiya is like lighting a lamp."

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Like most things of great worth, knowledge which is of eternal value comes only through personal prayer and pondering. These, joined with fasting and scripture study, will invite impressions and revelations and the whisperings of the Holy Spirit. This provides us with instruction from on high as we learn precept upon precept.

— Boyd K. Packer