ISB ~ Acts 17 v28

In him … our being:Probably a citation from the Greek poet Epimenides, who wrote in the sixth century B.C. The line summarizes Paul’s teaching that God created and sustains the world (CCC 301).

we are indeed his offspring:Cited from the Phaenomena, a work by the Greek writer Aratus, who wrote in the third century B.C. Paul cites Greek poetry elsewhere, in 1 Cor 15:33 and Tit 1:12.