Never disclose your weakness

अर्थनाशं मनस्तापम्
गृहे दुश्चरितानि च ।
वञ्चनं चापमानं च
मतिमान्न प्रकाशयेत् ॥

- चाणक्यनीतिः

- हितोपदेशः

A wise person should never divulge the loss of his wealth, distress in his mind, malpractices at his home or that he has been cheated or insulted.

Never disclose your weakness.