Why is it that, as humans, we only miss things when they’re gone?

We push them away, and then realize too late that it may have actually worked. 

We never notice what’s right in front of us.

But that’s who we are. We want what we can’t have, and don’t want what we get. We live in a place where there’s always a new version of whatever gadget we already have coming in next Christmas, and we’ve just gotta have it.

Why?

Why can we never just be content? 

Why can’t I just be content?