Joy ~ Elder Dallin H. Oaks

Joy and misery are eternal emotions whose ultimate extent we are not likely to experience in mortality. In this life we have some mortal simulations, which we call happiness or pleasure and unhappiness or pain. In the midst of these emotions is suffering. Some suffering comes from our own sins or those of others, but much suffering is simply an inevitable part of the mortal condition, like an accidental injury.

~ Elder Dallin H. Oaks, "Joy and Mercy," General Conference, October 1991.