How to Be Gracious, but Firm in Stance

I think Jesus, I think the command isn't in the form of a command in the Greek language specifically. When Jesus takes us back to creation, yes, saying one man, one woman, one flesh union. What books should I direct them for the softest approach or what is the best scripture to be gracious, but firm in stance? "People to be loved" has been kind of a go-to book for people under that category. It's like 70% like working through the text. But woven throughout is loads of stories that we've shared."