Aristotle argued that we are willing to sacrifice many things, but never happiness. Therefore, happiness is the goal of life. [Nicomachean Ethics, Aristotle]
He defines happiness, not as a fleeting moment, but the whole of life lived well.
How can you live well? He writes that we must use our mind, living above the everyday pursuits of plants and animals.
Augustine took this thought further by recognizing the limitations of the human mind. Philosophy can take us to the bridge, but Religion helps us cross over to the life we were designed for:
"God, you have made us for yourself, and our hearts are restless till they find their rest in you." --Augustine
For example, there are many things you use. However, they all pass away. The egg McMuffin you ate for breakfast is no more. The kiss you enjoyed with your girlfriend this evening is a passing memory. The one constant is God. Therefore, if you place your affections in the passing moment you will feel restless; in contrast, if you look to the good things of this world as gifts from God, you will turn every moment into honor and thanks to Him and deepen your attachment to Him who is permanent. You will build your life on God, and progressively live the way you were intended.[On Christian Teaching, Augustine]