Each person is like a puzzle piece. We all run around trying to figure out where we fit. But we, as tiny human beings, can't see or comprehend the big picture. It's like trying to understand the entire universe - we're just not big enough; we don't have that kind of mental capacity.
So if we can't see the big picture, how on Earth are we supposed to find where we fit?? If we can only see a couple of pieces at a time, how would we know if we fit in that place or if we need to move to a different part of the puzzle? What if we are in the right place and we can't tell because there aren't enough pieces around us?
Think of putting a puzzle together. If you get all the edge pieces connected, can you guess where that one middle piece goes? Maybe. Now zoom in to where you can't see any of the edge pieces. Pretty much impossible to get that one little piece in the right spot when you have no reference points.
Oh, if only we had the picture on the box to look at....! But didn't we just establish that we're too small to understand that picture?
Guess what? Life is like a puzzle, and only God can see the picture on the box. Oh thank goodness. If He can see the box, His perfect master plan, then we can rely on His guidance to get us to the right place in the puzzle of life.