Do not curse the king even in your thoughts, or curse the rich even in your bedroom, for a bird of the air may carry your words, and a winged creature may report your speech.
Jewish Publication Society of America Version (JPS1917) - Ecclesiastes 10:20 >Curse not the king, no, not in thy thought, and curse not the rich in thy bedchamber; for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.