On page 102-103 it says,
The returning army of crusaders had brought back strange heresies from the East which found a fertile soil among the discontented peasants and the growing populations in the towns. But the Church could do little. The secular clergy were far too ignorant, and the monks too remote and exclusive. The situation demanded a new type of Christian minister who would be a 'regular' in the sense that he would be under discipline, and yet free to go among men wherever he could find an opportunity of witnessing by word and by example to the faith that was in him.