You and I are standing this very second at the meeting place of two eternities: the vast past that has endured forever, and the future that is plunging on to the last syllable of recorded time. We can't possible live in either of those eternities - no, not even for a split second. But, by trying to do so, we can wreck both our bodies and our minds. So let's be content to live the only time we can possible live: from now until bedtime.
