Lactantius

“ Some one may perhaps ask how, when we say that we worship one God only, we nevertheless assert that there are two, God the Father and God the Son: which assertion has driven many into the greatest error. For when the things which we say seem to them probable, they consider that we fail in this one point alone, that we confess that there is another God, and that He is mortal. ”

“ And since He is both faithful to the Most High Father, and beloved by Him, He is not separated from Him; just as the stream is not separated from the fountain, nor the ray from the sun: for the water of the fountain is in the stream, and the light of the sun is in the ray: just as the voice cannot be separated from the mouth, nor the strength or hand from the body. When, therefore, He is also spoken of by the prophets as the hand, and strength, and word of God, there is plainly no separation ”

“ Therefore that highest and matchless God cannot be worshipped except through the Son. He who thinks that he worships the Father only, as he does not worship the Son, so he does not worship even the Father. ”