"But it comes from someplace that knows who you are" suggests that a sense of authenticity or self-awareness is rooted within an understanding of one's true identity. It emphasizes the importance of inner knowing and confidence in shaping who we are and what we can achieve.
The quote also reflects the idea that our potential for greatness depends on our own decisions and self-belief. Howard Stern implies that we have the power to determine our success by recognizing our true selves and making conscious choices about our future.