Always be a first-rate version of yourself, instead of a second-rate version of somebody else.
This encourages a focus on achieving a clear sense of your own identity. It is an important part of mental toughness in that you create real clarity for yourself and those around you, about who you are and what you stand for. This self-awareness helps you develop some principles and boundaries that help you take control of your own destiny.
Being a first-rate version of yourself builds your resilience. It helps you respond appropriately when you encounter situations that you are uncomfortable with. It provides you with an anchor when you feel lost or overwhelmed.