Aristotle

http://www.pursuit-of-happiness.org/history-of-happiness/aristotle/

Aristotle argues that happiness is a long term goal.  It isn't something that can be talked about in the short term.  He also argues that happiness is try act of trying to be moral.

"Happiness is the ultimate end and purpose of human existence

Happiness is not pleasure, nor is it virtue. It is the exercise of virtue.

Happiness cannot be achieved until the end of one’s life. Hence it is a goal and not a temporary state.

Happiness is the perfection of human nature. Since man is a rational animal, human happiness depends on the exercise of his reason.

Happiness depends on acquiring a moral character, where one displays the virtues of courage, generosity, justice, friendship, and citizenship in one’s life. These virtues involve striking a balance or “mean” between an excess and a deficiency.

Happiness requires intellectual contemplation, for this is the ultimate realization of our rational capacities."