Someone once enquired after the health and well-being of a wali (Friend of Allah) in the manner that is customary saying 'How are you'. The wali replied ' Do you ask after the well-being of a man who never experiences anything against his pleasure?' Amazed, the man asked whether this was really so, and the wali said 'Of course, I have made my desire in accordance with whatever Allah desires, and does anything happen that is against His Desire?'
The concept of 'fana' in tasawwuf is nothing more then this and every Muslim will do well to achieve it.
Happiness is so elusive in our times, but if we apply this simple formula as much as we can to the events in our lives, we too like this elder will be surprised when someone enquires how we are!