When George Müller’s wife of thirty-nine years died, he preached her funeral sermon from the text “Thou art good, and doest good” (Psalm 119:68, KJV).
Müller recounts how he prayed when he discovered she had rheumatic fever: “Yes, my Father, the times of my darling wife are in Thy hands. Thou wilt do the very best thing for her, and for me, whether life or death. If it may be, raise up yet again my precious wife—Thou art able to do it, though she is so ill; but howsoever Thou dealest with me, only help me to continue to be perfectly satisfied with Thy holy will.”
When she died, Müller said, “I bow, I am satisfied with the will of my Heavenly Father, I seek by perfect submission to his holy will to glorify him, I kiss continually the hand that has afflicted me... Without an effort my inmost soul habitually joys in the joy of that loved departed one. Her happiness gives joy to me. My dear daughter and I would not have her back, were it possible to produce it by the turn of a hand. God himself has done it; we are satisfied with him.”
Excerpted from Randy’s book If God Is Good: Faith in the Midst of Suffering and Evil.
 John Piper, “A Very Precious and Practical Doctrine."