Franklin suggests that even an enemy can provide something useful by pointing out faults that friends may overlook or hesitate to mention. Because an opponent has little reason to flatter, their criticism may draw attention to weaknesses that would otherwise remain unnoticed. The saying turns hostility into an unexpected opportunity for self-examination.

The advice does not mean that every accusation made by an enemy is accurate or should be accepted without question. Hostile criticism can be exaggerated, unfair or motivated by resentment. Franklin’s broader point is that criticism should be assessed for its truth rather than dismissed solely because of its source. If an opponent identifies a genuine weakness, recognising and correcting it can turn an unfriendly remark into useful knowledge. The capacity to learn even from those who dislike us is therefore presented as a form of self-awareness and practical wisdom.