Impressing people is utterly different from being truly impressive.

This idea is a key idea in his book Ego Is the Enemy, where he discusses how the ego can lead us to seek validation and approval from others, often at the cost of our true growth and authenticity.

Holiday emphasizes that impressing others is an external pursuit, based on seeking attention, validation, or admiration. In contrast, being truly impressive is about inner strength, character, and actions that align with your values, not influenced by the need to win the approval of others. True impressiveness comes from living with integrity, discipline, and purpose—qualities that are independent of how others perceive you.

So, the essence of the quote is to encourage you to focus on personal development and authenticity, rather than chasing fleeting recognition. Instead of trying to impress others, focus on being someone you can respect and admire, and others will take note in their own time.