[74] the one, as being pupils, in order to learn to display their own grateful dispositions in a similar manner, and the others as presiding over them, and as by their own experience being able to take care that no part of this hymn shall be out of tune, and also as feeling some doubt whether any human being bound up in a mortal body could be able to attune his soul to music in the same manner as the sun, and the moon, and the rest of the company of the stars, having properly conformed himself to that divine instrument, the heaven, and to the universal world.