If you are humble, you know that no success is ever created by you alone; there are other people involved, there are circumstances that contributed to your success, and so on. Humility allows you to enjoy the success without letting it affect you, without it creating arrogance in you. Equally, the grounded nature of a humble person is what also allows him or her to deal with failure when it happens. If you are humble, your ability to stay grounded through cycles of success and failure is much higher, and your ability to sustain long-term success is much higher as well.
