The interpretation given the words spoken, and the identity of the voice is ever dependent upon the time and character of the mind experiencing the Illumination.
Thus Moses claims to have heard the voice of the God of the Hebrews, but the probabilities are, that the "voice" is the mental operations of the person experiencing the phenomenon of supra-consciousness, and this interpretation will vary with what Professor James calls the "historical determination," i.e. it is dependent upon the age in which the illumined one lived, and upon the character of the impressions previously absorbed.
This apparent difference of report, as to the identity of the "voice," is of small import.
The salient point is that each person relating his experience has heard a voice giving more or less explicit instructions and promises.
In each instance it has been characterized as the voice of the God of their desire, and adoration.
Certainly, whatever may be our opinions as to whether God, as we understand the term, talked to Moses, giving him such explicit commands as the great leader afterwards laid down to his people accompanied by the insurmountable barrier to dissent or discussion, "thus saith the Lord," we can but admit that the prophet was possessed of intellectual power far in advance of his time, and his laws did indeed, save his people from self destruction, through uncleanliness and strife, and dense ignorance.
The ten commandments have been the "word of God" to all men for lo! these many ages, and even Jesus could but add one other commandment to those already in use: "Another commandment give I unto you—that ye love one another."
To sum up the evidences of cosmic consciousness, or Illumination, as reported in the case of Moses, we find:
The experience of great light as seen on Horeb.
The "voice" which he calls the voice of "The Lord."