Conviction listens and still stands. Stubbornness just stands.

Both look identical from the outside, which is why people confuse them constantly. The difference is not how firmly you hold a position, it is whether you can hear the other case while holding it. Conviction has met the counterargument and survived the meeting. Stubbornness has refused to be in the room with it.

Take something you feel sure about and go find the strongest version of the opposing view, not the weak one that is easy to knock over. If you still stand afterwards, you are standing on something. If you cannot bring yourself to look, that is your answer.