Gain vs Loss

how often have we came across this in life?

what is gain and what is loss?

for me they are pretty much linked to each other...

when we loss something,

we'll definitely gain something at the same time...

and the same goes to when we gain something.

we'll definitely loss something at the same time...

so i guess we need not to feel sad when we loss something

and happy when we gain something...

what goes around comes around...

stay neutral in life no matter what...