Spiritual Skills: Acceptance (No Regrets)

The Buddha taught that the way to Nirvana—peace, equanimity, joy, is to learn to accept the world as it is, rather than spend our mental, emotional, and spiritual energy resisting.  Acceptance is a vital spiritual discipline, but does it mean we give up?  Condone what is “wrong” with the world, and don’t try to change anything?  A strong “no” to that.  What DOES it mean for us in our increasingly “unacceptable” world?