Many a man curses the rain that falls upon his head, and knows that it brings abundance to drive away hunger.
I wish my deadly foe, no worse than want of fiends, and empty purse.
Curses always recoil on the head of him who imprecates them. If you put a chain around the neck of a slave, the other end fastens itself around your own.
Curses are like chickens, they always come home.
— Proverb
Cursing is invoking the assistance of a spirit to help you inflict suffering. Swearing on the other hand, is invoking, only the witness of a spirit to an statement you wish to make.
This is the curse of an evil deed, that it incites and must bring forth more evil.
Vexed sailors cursed the rain, for which poor shepherds prayed in vain.