The quote "If you would keep your secret from an enemy, tell it not to a friend" reflects a significant truth about trust and the nature of relationships. In Walter Isaacson's biography of Benjamin Franklin, this idea emphasizes that even those closest to us can sometimes betray our confidence. It suggests that secrets, especially sensitive ones, should be safeguarded carefully, as friends might inadvertently reveal them or may not guard them as vigilantly as expected.

This thought encourages us to be discerning about who we confide in, highlighting the complexities of human connections. Franklin, known for his wisdom and insight, warns that even well-meaning friends can be sources of vulnerability. Ultimately, protecting one's secrets requires a careful consideration of those we choose to share them with, underlining the importance of discretion and caution in our relationships.