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 …

…then can we truly be happy. Overall Aristotle's teachings have pointed out that happiness as an end in itself is the ultimate end and function of human beings. The only method of attainting this happiness is through reason. A life that does not exercise the capacity to reason will end up in some way being incomplete and never reach perfection. Therefore, reason is not only good for us but necessary to reach a compete life.