There's two ways I go on that one... when someone doesn't want to hear or understand what you are saying... depends on who it is. I do find different ways to say things and always make sure I'm being very clear. If the person is worth it to me, I keep trying. If the person isn't that close to me and they really don't impact my life, then I just stop talking about that particular subject. Then there are those that you KNOW will never listen, so why bother!
If the person does matter, and they still don't listen, I try to get them to read things that prove my point. If they won't, THEN THE HECK WITH THEM! LOL My hubby included!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.