-- Mk 9:2-13
Jesus often draws apart to pray in solitude, on a mountain, preferably at night. He includes all men in his prayer, for he has taken on humanity in his incarnation, and he offers them to the Father when he offers himself. Jesus, the Word who has become flesh, shares by his human prayer in all that "his brethren" experience; he sympathizes with their weaknesses in order to free them. It was for this that the Father sent him. His words and works are the visible manifestation of his prayer in secret.
-- CCC 2602