If we all had a crystal ball to see who would be important in the future, we would treat some people better, but we would also treat some people worse. I mean, most people you meet won't be critical to your future success, and especially not to history as a whole. If we had some mechanism to tell us who was most important, it would also tell us that most people are not, and we would definitely end up abusing that knowledge. Better to follow the Golden Rule and treat everyone as if they are as important (or more so) than yourself.
Mokalus of Borg
PS - I don't do that nearly well enough.
PPS - It's so simple to say and so hard to do.