A lot of Christians have this wrong idea that we ‘cannot put up quote by non-Christians’.
Such prejudice and bigotry is “not” Scriptural.
Please allow me to explain.
What does the Bible say?
Well, the bible records apostle Paul quoting the ‘non-believing poets’ in the following verses as being ‘right’ for these two quotes only:
“For in Him we live and move and have our being.’ As some of your own poets have said, ‘We are His offspring.’.” (Acts 17:28).
So, the only thing to worry is
(1) ‘not who we quote’
(2) ‘what we quote’ is “correct” or not (that, only God judges each man accordingly).
Please be ‘careful’ of what you ‘quote’ since it’s also written that:
“But I tell you that for every careless word that men shall speak they will be held accountable on the day of Judgement.” – Lord Jesus Christ in (Matthew 12:36)
“So then each one of us will give an account of himself to God.” – apostle Paul in (Romans 14:12)