• The Laws of Logic
• Christianity's distinctive, characteristic beliefs

This has been flagged as an appeal to authority. Before removing this flag, ensure the reasoning is based on the evidence the authority had, not the authority itself.

• The ecumenical councils held the position that the Son has always been fully God
• The positions of the ecumenical councils have stood up to scrutiny for 2,000 years
• If the positions have stood up to scrutiny for 2,000 years, they are true
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

Niceno-Constantinopolitan Creed

• Jesus could not fully save the elect from their sins if He had not always been fully God
• Jesus fully saved the elect from their sins
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

Athanasius

• Jesus is an unique being
• if Jesus is unique, the best way to understand Him as being divine
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

• Jesus is eternal
• if Jesus is eternal, He must have always been fully God
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

• Jesus is omniscient
• if Jesus is omniscient, He must have always been fully God
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

• Many in Jesus' day that He was God
• Jesus did not refute any of their claims while on Earth
• If the above is true, it is much more likely that the Son has always been fully God

• Jesus claimed to be God
• if Jesus claimed to be God, either He is a liar, a lunatic, mistaken, or telling the truth
• Jesus was not lying
• Jesus was not crazy
• Jesus was not mistaken
• If Jesus was God then, He has always been God
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

Lewis, C. S. Mere Christianity, 1952, 55-56. this citation has not been verified to be accurate.

• Jesus did things only God could do
• if Jesus did things only God could do, He must have always been fully God
• If the above is true, the Son has always been fully God

∴ the Son has always been fully God

x the Son has always been fully God