“The Mass must not be said without a Missal under the priest’s eye; nor in any language but that in which it has come down to us from the early hierarchs of the Western Church. But, when it is over, and the celebrant has resigned the vestments proper to it, then he resumes himself, and comes to us in the gifts and associations which attach to his person.
“He knows his sheep, and they know him; and it is this direct bearing of the teacher on the taught, of his mind upon their minds, and the mutual sympathy which exists between them, which is his strength and influence when he addresses them. They hang upon his lips as they cannot hang upon the pages of his book.”
-- Blessed John Henry Cardinal Newman
For further reading, click here. With thanks to Father George Rutler.