I see what you are saying John, thank you for making me think. The only thing I can say is they have been proven helpful. I see the quote I have as inspiration and has cheered me up. If they were inappropriate or hurtful symbols/words I would see a problem.
He cares about what's in your heart. It isn't what we put into our bodies (or on our bodies for that matter) that defiles us.
It's what comes out of our heart that defiles us.