When you are pursuing your greatness, you don't know your limits, and as a result, you must surround yourself with people who can make you grow and stretch, even if it means losing some of your friends that add no value to your growth. We all need someone to help us see and think outside our narrow perspective of what is.
We need someone who understands our potential even when we haven't yet accepted it ourselves. So surround yourself with people you can learn from, who can help you become the very best version of you because your time is short on this earth, and it makes no sense to limit your growth based on the limitations of others.
If you want greatness in your life, surround yourself with great people. If you strive to be a happy, fulfilled, honest, confident, empowered, and principled person, surround yourself with the same people. Choose your company wisely and always strive to become the very best version of you.