Ramayana
स त्वं पुरुषशार्दूल धैर्येण सुसमाहितः । त्यजैनां दुर्बलां बुद्धिं सन्तापं मा कुरुष्व ह ॥ 7-52-16 ॥
"Therefore, O tiger among men, well-composed through fortitude, give up this feeble state of mind and do not give yourself over to anguish."
english translation