Grebel Attacks Luther's Resistance to Reform

Conrad Grebel wrote:

I, Conrad Grebel, wanted to write to Luther in the name of us all and admonist him to give up sparing the weak, which he practices without Scriptural basis...--from Grebel's Letter to Müntzer

Luther's response to Karlstadt's demand that images be removed from churches immediately was that one should proceed slowly so that the "weak" would not be offended. Grebel agreed with Karlstadt that one must follow Scripture even if that means upsetting some.