Uncertainty.
I hate not knowing things. I hate waiting to find out things I need to know. But even more, I hate that I am so impatient.
I don't think I ever signed a contract that guaranteed me tomorrow, or even that I would finish this paragraph. Throughout history, the people we have considered wise have told us not to borrow tomorrow's evil, because today has enough of it's own. And yet there is always this nagging desire to know the future, even if only to a limited extent.
Someone once told me that, when I am looking for trouble, I should remember that trouble is already busy with weaker men. To be uncertain in and of itself is no crime. When I allow my desire to control my world to control me, and I don't value those around me out of frustration, then I have crossed a line. What I am surrounded by is of infinite value in comparison to that which is next to come.
In the end, it comes to this: We are here, and this is now. All else is philosophy.