It is said in the Mahabharat that Yudisthira cursed all female humans to be unable to keep a secret. This was after he learned that Kunti withheld from the Pandavas that Karna was in fact their brother (who Arjuna had to kill). But in the Bhagavad-gita, Krsna tells Arjuna, “Of secret things I am silence.” (BGAII10.38)Thus we learn that Krsna is the supreme secret-keeper.