Mormon Musings

https://www.lds.org/ensign/2010/03/learning-through-lifes-trials?lang=eng#footnote1-09203_000_015

When in situations of stress we wonder if there is any more in us to give, we can be comforted to know that God, who knows our capacity perfectly, placed us here to succeed. No one was foreordained to fail or to be wicked. When we have been weighed and found wanting, let us remember that we were measured before and we were found equal to our tasks; and, therefore, let us continue, but with a more determined discipleship. When we feel overwhelmed, let us recall the assurance that God will not overprogram us; he will not press upon us more than we can bear (D&C 50:40). Neal A. Maxwell, BYU Speeches of the Year 1978, p. 156 http://speeches.byu.edu/index.php?act=viewitem&id=909

The work of devils and of darkness is never more certain to be defeated than when men and women, not finding it easy or pleasant but still determined to do the Father's will, look out upon their lives from which it may seem every trace of God has vanished, and asking why they have been so forsaken, still bow their heads and obey.  Elder Jeffrey R. Holland, "The Will of the Father in All Things" (BYU Devotional, January 17, 1989) [Paraphrased from C. S. Lewis, The Screwtape Letters (New York: Macmillan Publishing Co., 1961), p. 39]

No man knows how much he can endure until he must.  Strength, patience, and ability increase with necessity. Richard L. Evans