Reason

Everything happens for a reason. There is nothing is this world that occurs without reason. You don't want to do your homework because you are lazy. That's a reason. You stop smoking because its unhealthy. That's a reason. Even if you wanna just not do anything at all because you don't feel like doing anything. That's a reason too.

If a non-existent reason appears, only one explanation that I can think of. That somebody wants to hide the reason. Concealed and never to be revealed. Not really truthful, ain't it?