Parallel Paths

There is this chinese saying that, the fact that you can meet some people in life, it is because of fate.

Does this also apply to those people who you have not met. The 'faceless', 'nameless' people in the crowded street whom you walk past everyday. 

Is there a chance that one day, you will know this 'faceless' people?

What do you say to those people whom you know, but who have walked at a path parallel to yours all these while?