"Whether the rock hits the pitcher or the pitcher hits the rock, it's generally bad for the pitcher?

That quote came from Sancho Panza in "Man of La Mancha" by Dale Wasserman. He was describing to a judge his relationship with his wife in the song "A Little Gossip." ". . . Yes, I hit her back, your grace; but she is much harder than I am. And you know what they say, whether the stone hits the pitcher or the pitcher hits the stone, it's going to bad for the pitcher."