The whole matter of finding the true foundation is made all the more difficult because these defiant weeds which have sprung upon it are called the true foundation by many; they, pulling to themselves the growth on top of the house ruins, declare, “This is the foundation and the way, all should follow it.” And with many of them we see that their new foundation sinks into soft ground, the floor settling at different levels. This shows the difficulty of finding the true foundation…

— Peter Chelčický, The Net of Faith, 1440-1443