We desire for many things in this human form of life. In fact we desire to be beautiful, to be intelligent, to be super rich and list goes on and on. At the end of the day, we cannot take even a farthing with us when we depart.
So we desire for things we cannot actually possess.
Then we cry our hearts out when we lose something. When it is suppose to be lost, it will be lost. The scriptures say that when we lose a wallet and if there are many people around it, if you are suppose to find it, you will still find it.
But if you have so much money stashed in your house, with full security, if the money is suppose to be stolen then it will happen.
The Lord arranges all these.
So we lament for those things that we lose when in fact we cannot possess them.