Augustine of Hippo

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(1. de Gen ad lit. cap. 2) Since all things were made by him, it is evident that light was also, when God said, Let there be light. And in like manner the rest. But if so, that which God said, viz. Let there be light, is eternal. For the Word of God, God with God, is coeternal with the Father, though the world created by Him be temporal. For whereas our when and sometimes are words of time, in the Word of God, on the contrary, when a thing ought to be made, is eternal; and the thing is then made, when in that Word it is that it ought to be made, which Word hath in It neither when, or at sometimes, since It is all eternal.