Never. I stick to Scripture.
Well then, I guess you never sing hymnns then either.
I guess you should do nothing but cite Scripture every single time you talk about God, Jesus, Christianity, religion, philosophy, the legal system, politics, charity, patriotism, work and anything else.
It's amusing that Paul cited pagan poets in Mars Hill when preaching to the Greeks in Athens, and not once cited the OT.
Should Paul have followed your premise?
I do.
I have just never bothered to learn any creeds, I never had any reason to.