'The wise of the world and the dull should be advised differently. For the wise should ignore what they know, and the dull should be encouraged to learn what they do not know. For the former, the first thing to eradicate is the notion that they are intelligent. For the latter, whatever is already known of heavenly wisdom is to be encouraged because, as they do not suffer from pride, their hearts are able to sustain some building.'
Gregory the Great, The Book of Pastoral Rule, p.98.