In the staging of opposites!

In the staging of opposites!
Each a beginning to an end:
As one door closes 'tight'
Another opens arms godsend
Calm, untroubled alight.

Everything has its origins?
From; the very first to the very last...
Quintessentially, the whole thing ripens
Into the present or the past...

Enter stage left, now exit—right.
With either virtue or vice
Love; is a subtle snakebite
Bitter sweet does entice.

Courteous or rude gentle or rough
On-wing shall she deliver?
On-high shall he retrieve his tariff?
{Make repair for the psyche’s draper.}