Christopher Hill said this quote

The radicals assumed that acting was more important than speaking. Talking and writing books, Winstanley insisted, is 'all nothing and must die; for action is the life of all, and if thou dost not act, thou dost nothing.' It is a thought worth pondering by those who read books about the seventeenth-century radicals, no less than by those who write them. Were you doers or talkers only? Bunyan asked his generation. What canst thou say?

~ Christopher Hill

Each generation ... rescues a new area from what its predecessors arrogantly and snobbishly dismissed as 'the lunatic fringe.

~ Christopher Hill