Ramayana
धर्मतो यो भवेद्विप्रः क्षत्रियो वीर्यतो भवेत् । क्रोधाद्यश्च भवेदग्निः क्षान्त्या च वसुधासमः ॥ 7-26-34 ॥
He who by his virtue would be a brahmin, who by his valour would be a kshatriya, who in his wrath would be fire, and in his forbearance the equal of the earth—
english translation