Luther - On Pain

"We have the comfort of this victory of Christ--that He maintains His Church against the wrath and power of the devil; but in the meantime we must endure such stabs and cruel wounds from the devil as are necessarily painful to our flesh and blood. The hardest part is that we must see and suffer all these things from those who call themselves the people of God and the Christian Church. We must learn to accept these things calmly, for neither Christ nor the saints have fared better."
Sermons of Martin Luther, 8 vols., ed., John Nicholas Lenker, Grand Rapids: Baker Book House, 1983, III, p. 263. Exaudi. John 15:26-16:4.

"Therefore the Holy Spirit must come to our rescue, not only to preach the Word to us, but also to enlarge and impel us from within, yea, even to employ the devil, the world and all kinds of afflictions and persecutions to this end. Just as a pig's bladder must be rubbed with salt and thoroughly worked to distend it, so this old hide of ours must be well salted and plagued until we call for help and cry aloud, and so stretch and expand ourselves, both through internal and through external suffering,that we may finally succeed and attain this heart and cheer, joy and consolation, from Christ's resurrection."
Sermons of Martin Luther, 8 vols., ed., John Nicholas Lenker, Grand Rapids: Baker Book House, 1983, II, p. 253. Easter, Third Sermon. Mark 16:1-8.

"Now what does the poor woman do? She turns her eyes from all this unfriendly treatment of Christ; all this does not lead her astray, neither does she take it to heart, but she continues immediately and firmly to cling in her confidence to the good news she had heard and embraced concerning Him, and never gives up. We must also do the same and learn firmly to cling to the Word, even though God with all His creatures appears different than His Word teaches. But, oh, how painful it is to nature and reason, that this woman should strip herself of self and forsake all that she experienced, and cling along to God's bare Word, until she experienced the contrary. May God help us in time of need and of death to possess courage and faith!"
Sermons of Martin Luther, ed., John Nicholas Lenker, Grand Rapids: Baker Book House, 1983, II, p. 150. Matthew 15:21-28;

"If I only kept in mind that He gave me eyes, truly a very great treasure, it would be no wonder if shame caused my death, because of my ingratitude in that I never yet thanked Him for the blessing of sight. But we do not see His noble treasures and gifts; they are too common. But when a blind babe happens to be born, then we see what a painful thing the lack of sight is, and what a precious thing even one eye is, and what a divine blessing a healthy, bright countenance is; it serves us during our whole life, and without it one would rather be dead; and yet no one thanks God for it."
Sermons of Martin Luther, 8 vols., ed., John Nicholaus Lenker, Grand Rapids: Baker Book House, 1983, V, p. 129. Sixteenth Sunday after Trinity. Luke 7:11-17