" But at keast we know that the Brotherhood was both a scientific academy and a monastic order; that its members led an ascetic communal life where all property was shared, thus anticipating the Essenes and the primitive Christian communities. We know that much of their time was spent in contemplation, and that initiation into the higher mysteries of mathematics, astronomy, and medicine depended upon the purification of spirit and body, which the aspirant had to achieve by abstinences and examinations of conscience. Pythagoras himself, like St. Francis, is said to have preached to animals; the whole surviving tradition indicates that his disciples, while engaged in number-lore and astronomical calculations, firmly believed that a true scientist must be a saint, and that the wish to become one was the motivation of his labours. "

― Arthur Koestler , The Act of Creation