Faith

"Even if you exercise your strongest faith, God will not always reward you immediately according to your desires. Rather, God will respond with what in His eternal plan is best for you. He loves you to a depth and completeness you cannot conceive of in your mortal state. Indeed, were you to know His entire plan, you would never ask for that which is contrary to it even though your feelings tempt you to do so. Sincere faith gives understanding and strength to accept the will of our Heavenly Father when it differs from our own. We can accept His will with peace and assurance, confident that His infinite wisdom surpasses our own ability to comprehend fully His plan as it unfolds a piece at a time."

Elder Richard G. Scott 2003
http://lds.org/liahona/2003/05/the-sustaining-power-of-faith-in-times-of-uncertainty-and-testing?lang=eng