Wanna be friends?

This weekend I went to the park with a friend and her niece. It being a Saturday there were kids running around all over the place.

One little girl came up to a boy about her age that was playing on the monkey bars. She walked right up to him and the first words out of her mouth were "Wanna be friends?"

The boy looked down from his perch above her and without hesitation answered "ok." They then introduced themselves and started talking about how one of them lived really far away and the other one lived really close, among other things that 4 year olds would talk about. For the rest of the time i was there these two kids ran around that park together, sometimes helping each other over the obsticles in the playground, acting as if they had known each other their whole lives.

For some reason this little exchange caused me to evaluate my life, and how easy some things should be. If we took the view of this little girl and assumed everyone was a possible good friend until we had reason not to how much more inviting would life be?