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This rule applies to this verse. You have two nouns connected by the word "and." Those two nouns are God and Saviour. The first noun has the article in front of it ("the") and the second noun does not (there is no "the" before Saviour).
This means that the two nouns are identified as the same individual. So according to the rules of Greek grammar, the "great God" is identified as "our Saviour Jesus Christ."
But you don’t need to know Greek grammar to come up with this same conclusion. Just use your common sense and think about what the verse is saying.
Who is the One who is coming again? Who is the One who is going to appear in a glorious way and in a visible way? God the Father is not going to appear. This verse is not talking about the coming of God the Father, it’s talking about the coming of Jesus Christ, our Saviour. He’s the One it’s talking about and He is the one who is described as "THE GREAT GOD.""
Titus 2:13 and the Deity of Christ
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In review, why does this verse teach that Jesus Christ is God?
1. The grammar. The one article "the" links the phrase "the great God" with "our Saviour Jesus Christ." Who is the Great God? He’s our Saviour Jesus Christ.
2. The great God is described as appearing, and according to Biblical teaching, we are looking for Jesus Christ to appear but not God the Father.
3. The term "great God" is consistent with what Jesus is called in other places. He’s called "the mighty God" and "the true God." If He is called GOD elsewhere in the Bible, then why not in this passage as well?
4. The term "great" in the New Testament is used to describe Jesus Christ several times but it is never used to describe God the Father."
Titus 2:13 and the Deity of Christ
"The construction in Greek is known as the Granville Sharp rule, named after the English philanthropist-linguist who first clearly articulated the rule in 1798. Sharp pointed out that in the construction article-noun-καί-noun (where καί [kai] = “and”), when two nouns are singular, personal, and common (i.e., not proper names), they always had the same referent."
Is Jesus called “God” in Titus 2:13?
"Moreover, grammatically, both of these nouns (“God and Savior”) modify Christ. There is a grammatical rule in NT Greek that whenever the article (“the”), a substantive (“noun”),
kai (translated “and, but, even, also, namely”), and a substantive (noun) are used, they always refer to the same person.
[1] This is called the TSKS construction.
[2] Thus this expression (τοῦ μεγάλου θεοῦ καὶ σωτῆρος) must all refer to Jesus. Greek grammarian Daniel Wallace affirms, “There is no good reason to reject Titus 2:13 as an explicit affirmation of the deity of Christ.”
[3]"
(Titus 2:13) Does this passage support the deity of Christ? | Evidence Unseen
The above statements are made by well know Greek Scholars. It was proved in Court that France did not know biblical lanuages as he claimed he did. He could not read a verse a first grader can read.