Anf-01 vi.i Pg 10
It is to be observed that this writer sometimes speaks as a Gentile, a fact which some have found it difficult to account for, on the supposition that he was a Hebrew, if not a Levite as well. But so, also, St. Paul sometimes speaks as a Roman, and sometimes as a Jew; and, owing to the mixed character of the early Church, he writes to the Romans iv. 1 as if they were all Israelites, and again to the same Church (Rom. xi. 13) as if they were all Gentiles. So this writer sometimes identifies himself with Jewish thought as a son of Abraham, and again speaks from the Christian position as if he were a Gentile, thus identifying himself with the catholicity of the Church.

Anf-02 vi.iv.i.vii Pg 6.1

Anf-03 iv.ix.iii Pg 3
See Gen. xii.–xv. compared with xvii. and Rom. iv.

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Treasury of Scriptural Knowledge, Chapter 8

VERSE 	(31) - 
Ro 4:1