"And it is easy to believe you are not good enough if you listen to everybody else"

In this quote, Mackenzie Astin is highlighting the negative impact of constantly looking for validation and approval from others. He recommends that if we constantly listen to what others say about us, we may begin to question our own worth and capabilities. This can result in an absence of self-esteem and a belief that we are not good enough. Astin is advising us that it is important to trust in ourselves and not let the opinions of others specify our self-regard. Ultimately, this quote functions as a pointer to concentrate on our own beliefs and values instead of seeking recognition from external sources.