Limitations

It's a basic economical principle: resources are scarce.

And that is why we cannot be exposed to everything. We cannot retain a memory of everything we are exposed to. We can gain knowledge but we also lose some of it because there is just so much to learn everyday. It is also why we cannot do everything that we please. And we cannot be good at everything we do. We cannot get everything we want. At the same time we cannot fully appreciate everything we have.

This is one of the things in life which we must learn to accept.