You might also discuss the four levels of happiness, which are:
I. Materialistic Pleasures and Possessions
II. Egotistical Accomplishments
III. Intimate Relationships of Love with Other Human Creatures
IV. Intimate Relationship of Love with God
What this analysis shows is that only the love of an Infinite Being of Love could ultimately satisfy the longing of our hearts. In other words, attempting to make any of the first three levels a source of total fulfillment is fleeting. For example, trying to make physical pleasure the ultimate leads to the hell of addiction (for example, talk to any 12-step group for alcohol, drugs, sex, etc, and they will verify this).
Secondly, attempting to place accomplishments as the ultimate is equally futile, for even if we accomplished everything possible in this world, if we must come home to an empty house, with no friends or family, we would be lonely and miserable.
hence, it is ultimately love that we are looking for, love that is deep, intimate, intellectual and personal. Therefore, what we long for is the Heaven of Catholicism, the possession of the Infinite Love who is God as the primary happiness, the love of myriads of creatures (the saints and angels) as a secondary happiness.
scott