Discipline is something you should have. You should always be very disciplined. You should be able to say NO to the wrong thing and YES to the right thing.

You should have ethics you follow. This are your personal rules and policies. For instance, I met a girl in secondary school, no matter how hungry she is she would NEVER NEVER EVER ask you for the snack you are eating or for food, water anything. That's a personal ethics, she doesn't collect anything edible like snacks or food.

I have my personal ethics too. This are my private policies that I follow.

Being disciplined is being able to have strong control over your attitude 🙂