Tertullian

“ But in proof that the Greek word means nothing else than beginning, and that beginning admits of no other sense than the initial one, we have that (Being) [1] even acknowledging such a beginning, who says: “The Lord possessed [2] me, the beginning of His ways for the creation of His works.” ”

“ For since all things were made by the Wisdom of God, it follows that, when God made both the heaven and the earth in principio—that is to say, in the beginning—He made them in His Wisdom. If, indeed, beginning had a material signification, the Scripture would not have informed us that God made so and so in principio, at the beginning, but rather ex principio, of the beginning ”