The door to success swings on the hinges of opposition.
"Remarkably, this saying implies that opposition is not just a natural accompaniment or antecedent of success, but that it is a means by which the door opens. One can think of many biblical examples. The opposition of Joseph’s brothers opened the door to his leadership in Egypt. The taxing of the empire opened the door to getting the Messiah born in Bethlehem, not Nazareth, and thus fulfilling prophecy. The betrayal of Judas opened the door to the salvation of the world." (From the Desiring God website.)
This makes us think of opposition differently, doesn't it?