From a letter by Martin Luther to his wife, Katie, July 2, 1540, writing about the recovery of Philip Melanchthon from a severe illness.
… Master Philip truly had been dead, and really, like Lazarus, has risen from death. God, the dear father, listens to our prayers. This we [can] see and touch [with our hands], yet we still do not believe it. No one should say Amen to such disgraceful unbelief of ours.
Luther's Works, Letters III, Vol. 50, edited by J. J. Pelikan, H. C. Oswald and H. T. Lehmann, Fortress Press, letter # 290.