Seneca advocates for intentional relationship choices based on mutual growth rather than mere compatibility or convenience. The ideal social circle includes both mentors who inspire us to become better and people we can help develop. This creates a dynamic environment of continuous improvement where everyone is both teacher and student. It doesn't mean abandoning friends who aren't philosophically minded, but it does mean being deliberate about who we spend significant time with, recognizing that we inevitably become more like the people around us. Our relationships should challenge us to grow while offering us opportunities to contribute to others' growth.