Greek philosophers looked upon the past and the future as the primary evils weighing upon human life, and as the source of all the anxieties which blight the present. The present moment is the only dimension of existence worth inhabiting, because it is the only one available to us. The past is no longer and the future has yet to come, they liked to remind us; yet we live virtually all of our lives somewhere between memories and aspirations, nostalgia and expectation.
