Truth and doctrine, are to be preached always, openly, and firmly, and are never to be dissembled or concealed; for there is no offence in them; they are a staff of uprightness.--And who gave you the power, or committed to you the right, of confining the Christian doctrine to persons, places, times, and causes, when Christ wills it to be proclaimed, and to reign freely, throughout the world?
He does not say--preach it to some and not to others.
You see therefore, again, how rashly you run against the Word of God, as though you preferred far before it, your own counsel and cogitations.
Martin Luther from...
"Erasmus' Preface Reviewed, Section XXI," The Bondage of the Will