Never floss with a stranger.

“Never floss with a stranger.” — Joan Rivers

In this sharp and witty saying, Joan Rivers, the queen of fearless comedy, hides deep wisdom behind laughter. At first hearing, her words seem absurd — a simple joke meant to provoke a smile. But like all great humorists, Rivers spoke truths that reached beyond the surface. To “never floss with a stranger” is not merely about the literal act of sharing dental hygiene; it is a proverb for the soul. It warns us against intimacy without trust, against exposing our most private selves to those who have not yet earned the right to witness them. Beneath its laughter, it carries the voice of experience: be careful who you let close enough to touch what is delicate, personal, and real.

The ancients understood this lesson, though they might have said it differently. They spoke of guarding the inner sanctum of the heart, of keeping one’s sacred space from those who would not honor it. The Stoics, wise and measured, taught that friendship must be built slowly — tested as gold is tested by flame. Even Aristotle, who celebrated friendship as one of life’s highest goods, warned that true closeness cannot be rushed. Rivers, with her characteristic wit, expresses the same truth in modern tongue: do not share your vulnerabilities with those you do not yet know. For to “floss with a stranger” — to bare your imperfections before an unproven soul — is to risk both discomfort and regret.

In her own life, Joan Rivers knew the price of misplaced trust. As a woman in the fierce and competitive world of show business, she learned that not all who smiled were friends, and not every outstretched hand meant help. She had seen confidences betrayed, secrets shared, and kindness repaid with cruelty. Her humor became her shield and her sword — a way to speak truth without bitterness. When she told us to “never floss with a stranger,” she was laughing at herself, yes, but she was also warning her audience: not everyone deserves to see your unguarded moments. Protect your boundaries, or the world will mistake your openness for weakness.

There is a story from ancient times that echoes this same wisdom. In the court of King Croesus, there lived a philosopher named Solon. The king, rich beyond measure, invited Solon to his palace and, in his pride, showed him his treasures. “Tell me,” said Croesus, “have you ever met a man happier than I?” Solon, wise and calm, replied, “Count no man happy until he is dead, for life is uncertain and fortune fickle.” Croesus, offended by this restraint, dismissed Solon coldly. Yet years later, when war and ruin came upon him, Croesus cried out for Solon’s name — remembering the wisdom he had once rejected. Thus, even kings learned that to reveal one’s pride or weakness to the wrong person can bring humiliation, and that wisdom must always walk hand in hand with discretion.

Rivers’ quote, though wrapped in jest, speaks also of dignity — the quiet power of self-respect. In an age that prizes oversharing, she reminds us that not all things need to be exposed. The ancients would have called this temperance, the virtue of knowing what, when, and to whom to reveal oneself. For not every conversation is sacred, and not every listener is kind. There are people who will mock your pain, twist your truth, or use your openness as a weapon. “Never floss with a stranger,” then, becomes a timeless lesson in self-protection: share your inner world as you would share a treasure — with care, discernment, and wisdom.

Yet her humor also carries gentleness. Rivers does not tell us to be cold or closed; she merely warns us to be mindful. There is joy in connection, laughter in vulnerability, but both require trust. To open your heart to another is one of life’s great risks, but to do so too soon is to invite harm. The wise do not build walls; they build gates — doors that open only when the right person knocks. And when such a person arrives — a friend, a confidant, a kindred soul — then you may laugh, be foolish, be human without fear. Until then, guard your spirit lightly, but firmly, as one guards a flame against the wind.

So, my child, remember this: in every jest lies a grain of truth, and in every truth, a shadow of caution. Be open, but not reckless; be kind, but not naïve. Laughter is holy, but so is discernment. When Joan Rivers said, “Never floss with a stranger,” she taught us how to live in a world both beautiful and treacherous — to balance humor with wisdom, warmth with boundaries, and honesty with care. For those who learn this balance will walk through life both joyful and unbroken, able to share their hearts without losing themselves.

And so, laugh freely, but trust slowly. Love deeply, but wisely. For the wise man and woman know: not every hand that reaches toward your smile deserves to touch your soul.