3.  And let no one suppose it to be a thing incredible that the brightness of the light is one thing, and the body which is its material vehicle is another.  First, in all composite things, we distinguish substance susceptible of quality, and the quality which it receives.  The nature of whiteness is one thing, another is that of the body which is whitened; thus the natures differ which we have just seen reunited by the power of the Creator.  And do not tell me that it is impossible to separate them.  Even I do not pretend to be able to separate light from the body of the sun; but I maintain that that which we separate in thought, may be separated in reality by the Creator of nature.  You cannot, moreover, separate the brightness of fire from the virtue of burning which it possesses; but God, who wished to attract His servant by a wonderful sight, set a fire in the burning bush, which displayed all the brilliancy of flame while its devouring property was dormant.  It is that which the Psalmist affirms in saying “The voice of the Lord divideth the flames of fire.” Ps. xxix. 7.  Thus, in the requital which awaits us after this life, a mysterious voice seems to tell us that the double nature of fire will be divided; the just will enjoy its light, and the torment of its heat will be the torture of the wicked.