Lack of love=heaviness

Lack of friendship=heaviness

Lack of energy=heaviness - or is it that  heaviness causes the lack of energy?

Lack of money=heaviness

So, then, how does lack, [being without or low on; having a deficiency or absence of something that is needed; to be entirely without and in need of], lead to feeling such heaviness?

And how can plenty [a full or completely adequate amount or supply; as much as one could want; ample quantity; abundance] make you feel so light?