I think a gentleman is someone who holds the comfort of other people above their own. The instinct to do that is inside every good man, I believe. The rules about opening doors and buying dinner and all of that other 'gentleman' stuff is a chess game, especially these days.
“If your determination is fixed, I do not counsel you to despair. Few things are impossible to diligence and skill. Great works are performed not by strength, but perseverance.”