According to Aristotle, how is it that being a good person will also lead to happiness?

"Happiness is when what you think, what you say, and what you do are in harmony."
- Mahatma Gandhi
AS
"Happiness depends upon ourselves."
- Aristotle
In Nichomachean Ethics, Aristotle argues the highest end is the human good, and claims that the highest end pursued in action is happiness. Also, Aristotle claims that happiness is achieved only by living a virtuous life - "our definition is in harmony with those who say that happiness is virtue, or a particular virtue; because an activity in accordance with virtue implies virtue. Indeed, we may go further and assert that anyone who does n…