I think three times is fine, for emphasis. Besides, it shows he's learning and Evolving. Now that he has that structure of knowledge, he can use it for something else. Before he wasn't able to quote even himself, now with any luck, he can quote who(m)ever he chooses.
portokalos, interesting! So it is your hypothesis that heresies or cacodoxies , still lurking "in the East," within certain congregations of the Church lead to an environment of confusion that allowed Islam to gain a foothold.
'Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination.' -Max Planck