I am a Time Lord. I'm not a human being. I walk in eternity…
I was being overly dramatic that day, and I know it. 900 years is a long time relative to their experience, and sometimes it seems like an eternity, but it is not quite forever. Not that it makes any difference to these people. 200 years or 2000, it doesn't matter. Both are a theoretical possibility, something the most clever of them can almost (but not quite) stretch their imagination to encompass, but in the end, the expanse of time is still just a distant fairy tale. Some of the longer-lived races (that is, those with more time to cultivate their arrogance) like to berate them for their lack of foresight, but when you will never live to see the future, why would you think to worry over it? Their kind live and die like flowers in the field, one generation all but forgetting the last. Here and now is what they hold dear. They delight in the act of living, stare in wonder at the stars beyond their reach. These are creatures made to act, to feel—not to sit and watch and ponder and weigh a million possibilities while doing nothing about them. I enjoy keeping them around to remind me what is worthwhile in this universe.
Some wonder why I choose these ephemeral and limited creatures for my companions. I often wonder why you'd choose anything else.