"Man can touch more than he can grasp." ~ Gabriel Marcel
We have a very short time on this planet. While we might think that 80 or 90 years sounds like such a long time, in reality it is the bat of an eye when considering the length of history. In our lifetimes, we'll see and take part in many different experiences with many different people in many different places. And while we might have the instinct to take part in any and every way that we can, we just can't. We have to choose where and how and on whom to spend our time and energy.
Where will we have the most impact? Where will we find the most joy? Do we care about life-long learning or is it connection with others that is most important to us? These types of questions are critical for us to consider and answer when we think about what we'd like to do with our time here.
There are millions of ways for us to make a difference - there are so many places, people, and things that will somehow enter our lives. The only question we really have to answer is, "which experiences we will witness and let pass and which are the ones that are we will hang onto for longer than a moment?"