Because of our rejection by others we can truly sympathize with others facing the same sort of thing. I have several Hispanic friends. They are often assumed to be criminals and lazy and worthless by many of the whites. They face various levels of discrimination and prejudice. Because of my own experiences, I can more fully empathize with their situations.
Pain calls out to pain.
Those of us who have experienced the pain of being despised and rejected are the perfect ones to minister to those who are facing the same thing. However, too often we set in our own pain and never reach out to others. The greatest miracles for you will come when you are praying for another. For I reckon that the sufferings of this presenttime are not worthy to be compared with the glory which shall be revealed in us. Jesus was despised, rejected, spat upon, condemned, beaten, abused in every conceivable way.