What played an important role in the spread of both roman catholicism and orthodox christianity?

An important role in the spread of Christianity, both Catholic and Orthodox, is the Monasticism. It is believed that the "father of monasticism" was Antony the Great, who lived in the desert, by the ascetic way of life. although there were many before him. The characteristic of the monastic way of life is asceticism, prayer, in the aspiration to attain the gospel of values, according to the rules of early Christianity. Those who live this way of life are known as monks-men and nuns-women.

the answer is a) to be able to obey them.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.