Balance out the good things and the bad that have happened in your life and you will have to acknowledge that you are still way ahead. You are unhappy because you have lost those things in which you took pleasure? But you can also take comfort in the likelihood that what is now making you miserable will also pass away.
Men who give up the common goal of all things that exist, thereby cease to exist themselves. Some may perhaps think it strange that we say that wicked men, who form the majority of men, do not exist; but that is how it is. I am not trying to deny the wickedness of the wicked; what I do deny is that their existence is absolute and complete existence. Just as you might call a corpse a dead man, but couldn't simply call it a man, so I would agree that the wicked are wicked, but could not agree that they have unqualified existence.