The great thinker and diplomat Acharya Chanakya has outlined many important principles for living in his famous book, "Chanakya Niti." He emphasizes that one should always keep certain things secret, no matter how close the person is. Revealing these things could cause significant harm in the future:

Your Income/Salary: According to Chanakya, you should not disclose your true income and assets to anyone. This will save you from unnecessary trouble.

Your weaknesses: Do not mention your weaknesses to anyone, because today's friend can become tomorrow's enemy and can take advantage of your weaknesses.

Disputes between husband and wife: Quarrels in married life are completely personal, hence never reveal them to any third person.