"Change your circle before you become a square" suggests that it's important to evaluate and possibly change the people you associate with to avoid becoming stagnant or conformist. It implies that your social environment significantly influences your personal growth and mindset. If you surround yourself with people who are positive, innovative, and supportive, you are more likely to thrive and stay dynamic. Conversely, if your circle is limiting or negative, you risk becoming rigid and losing your individuality.