"All existence originates from the Father. In Christ and through Christ, God is the source of everything. In contrast to everything else, He is completely self-existent. ... He is infinite, for nothing can contain Him. ... He is eternally prior to time, for time is His creation. Imagine what you think might be God's farthest limit, and you will find Him present there. ... Words will fail you, but His being will not be restrained. ... Exercise your intellect to comprehend Him as a whole, but He will eluse you. ... Therefore, since no one knows the Father but the Son, let our thoughts of the Father be one with the thoughts of the Son. He is the only faithful Witness who reveals God to us."
— Hilary of Poitiers, On the Trinity