Translation
If we receive the testimony of men, the testimony of THEOS is greater because
Go to footnote numberthis is the testimony of THEOS, that He has testified concerning His Son.
Paraphrase
If we are willing to receive the testimony of men, we should be even more accepting of the more reliable witnesses provided by THE CREATOR AND OWNER OF ALL THINGS; the reason the things mentioned above are a greater testimony is that they are the proof provided by THE CREATOR AND OWNER OF ALL THINGS that His Son, Jesus, is also God.
Footnotes
1
This introduces a causal idea, meaning the reason behind what was just said. The testimony of God is greater, not only because He is God, but also because of what He is providing evidence about – the answer to the question, “Who is Jesus?”