"When the murder of John the Baptist was announced, that horrible crime, [Jesus] was silent, went away into the desert, fed the people, and did not make an issue of it, but only preached the Word and did His duty. Christian wisdom, therefore, means to commit oneself to the power of God and to turn one’s cause over to Him who judges justly. A Christian can indeed, by the office of the Word, judge sin, but he should not raise his hand against it unless he is compelled to do so by God or commanded by the Word. And so when you are alone and unable to set everything right and straight, commit your cause to Him who has more powers and who alone can do everything."
M. Luther, Luther's Works, Vol. 15 :
Ecclesiastes, Song of Solomon, Last Words of David, 2 Samuel 23:1-7, ed.
J. J. Pelikan, H. C. Oswald & H. T. Lehmann, Luther's Works (Saint
Louis: Concordia Publishing House, 1999, c1972). Ec 1:16.
.... as a note - Luther's lectures on Ecclesiastes are BRILLIANT!