One who wishes for the destruction of a foe, should not make that foe careful. On the other hand, one should never display one's anger or fear or joy. He should conceal these within his own heart.
न शत्रुर्विवृतः कार्यो वधमस्याभिकाङ्गता। क्रोधं भयं च हर्षं च नियम्य स्वयमात्मनि॥