This is one of my favorite quotes of all time. From philosopher Epicurus. Words to live by every day, once we have what we want it ceases to make us happy and we are on to wanting the next thing. Be grateful, appreciate, and you will be happy.
I am determined to be cheerful and happy in whatever situation I may find myself. For I have learned that the greater part of our misery or unhappiness is determined not by our circumstance but by our disposition.