Being on time isn’t for the sake of the other person. It’s a reflection of your own self-respect, and of your own mental and physical organization. You’ll find that people who are habitually late, and who don’t care about it, are simply out of focus, and have low standards. You’ll find that people who are habitually late, and who feel guilty about it, are concerned about others, but not for themselves. They are “codependent” types caring for the world while neglecting themselves. If someone is habitually on time, they have already told you a lot about who they are — and what they aren’t.