[47] For what life can be better than that which is devoted to speculation, or what can be more closely connected with rational existence; for which reason it is that though the voices of mortal beings are judged of by the faculty of hearing, nevertheless the scriptures present to us the words of God, to be actually visible to us like light; for in them it is said that, "All the people saw the voice of God;" [51] they do not say, "heard it," since what took place was not a beating of the air by means of the organs of the mouth and tongue, but a most exceedingly brilliant ray of virtue, not different in any respect from the source of reason, which also in another passage is spoken of in the following manner, "Ye have seen that I spake unto you from out of heaven," [52] not "Ye have heard," for the same reason.