[29] therefore I drink insatiably of this well-mixed cup, which persuades me neither to speak freely without prudent caution; nor, on the other hand, to think so much of caution as to lose my freedom of speech. For I have learnt to appreciate my own nothingness, and to look up to the excessive and unapproachable height of thy munificence; and whenever I know that I am myself "but dust and ashes, " or even, what is still more worthless, if there is any such thing, then I feel confidence to approach thee, humbling myself, and casting myself down to [26] the ground, so completely changed as scarcely to seem to exist.