Lirfuas Ephraim Zalmen ben Adina Shaindel.
People are often sad because they lack the material wealth for which they yearn. Rabbeinu Bechaye explains that what we REALLY need, the world has in abundance.
We can't live without oxygen so oxygen is EVERYWHERE. We need water and the world is FILLED WITH WATER. We need food and there is a lot of food to be found.
But people also want fancy cars, vacations, large savings accounts etc. etc. These things are less common. If one is only going to be happy if he actualizes all of his material desires, he is setting himself up for a life of disappointments.
LET GO OF YOUR DESIRES FOR LUXURIES!!:-):-)