These are "verified" quotes of pagan authors which were used by Apostles. These quotes became common sayings and, apparently, used to convey Divine Truths in an understandable manner.
"Cretans, always liars, evil beasts, idle bellies."
and
"For in him we live, and move, and have our being" - https://en.wikipedia.org/wiki/Epimenides
"Now, if death is like this, I say that to die is gain; for eternity is then only a single night." - https://en.wikiquote.org/wiki/Socrates
In Acts 17:28 "For we are also his offspring" - a quote from astronomic poem by Aratus (315 BC – 240 BC) - https://en.wikipedia.org/wiki/Aratus
https://en.wikipedia.org/wiki/Menander
https://en.wikipedia.org/wiki/Tha%C3%AFs
Quotes of pagan writings in the Bible
Epimenides
Our Holy Apostle Paul quoted pagan poet Epimenides' (7th or 6th century BC) Ode to Zeus in his letter to Titus 1:12-13:"Cretans, always liars, evil beasts, idle bellies."
and
"For in him we live, and move, and have our being" - https://en.wikipedia.org/wiki/Epimenides
Socrates (470 BC – 399 BC)
In Philippians 1:21 "...to die is gain..." Apostle Paul loosely quoted Socrates' words:"Now, if death is like this, I say that to die is gain; for eternity is then only a single night." - https://en.wikiquote.org/wiki/Socrates
In Acts 17:28 "For we are also his offspring" - a quote from astronomic poem by Aratus (315 BC – 240 BC) - https://en.wikipedia.org/wiki/Aratus
Menander
1 to Corinthians 15:33: "evil communications corrupt good manners" - a quote from a comedy Thaïs by Menanderhttps://en.wikipedia.org/wiki/Menander
https://en.wikipedia.org/wiki/Tha%C3%AFs
