The Buddha or the ‘Enlighten One’, has stated that the root cause for unhappiness is attachment. Attachment to people, possessions, property or power. The loss of these will make us unhappy, but detachment would make us indifferent.

Prince Siddhartha never saw unhappiness until he left his palace on a chariot ride where he saw the poor, the suffering and the dying. It was then he decided to give up all wordly possessions or in other words attachments and seek enlightenment. The goal was to free an individual from sadness not only in this birth but in subsequent births.

Nothing is constant but change and nobody is immortal. Therefore in our lives there will definitely be a time when we will lose possessions or people. Paraphrasing the Gita by saying that what is yours today belonged to someone else yesterday and will belong to another tomorrow so why feel sad losing it?

If the importance of money, wealth and power can be removed from our lives we would be definitely a little happier.
My personal musings.