"敵がいない男は、個性がない男である。"

Simplified Meaning:

Having no enemies might suggest that someone always tries to please everyone and avoids standing up for what they believe in. When you have strong beliefs or principles, you might sometimes clash with others who disagree. For example, think of a person who fights for the rights of the poor. They might make enemies among those who benefit from keeping things the way they are. In history, leaders like Martin Luther King Jr. had enemies because of his fight for civil rights, but this also showed his strong character and commitment to justice. To apply this to your own life, don’t be afraid to stand up for what’s right or important to you, even if it means some people might disagree with you or dislike you. Having enemies can sometimes be a sign that you have strong principles and the courage to stick to them.