Mahabharat
कषत्रियॊ बाहुवीर्यस तु न तथा वाक्यवीर्यवान अप्रगल्भं वचस तस्य तस्माद बार्हद्रथे समृतम ॥ २-१९-४७ ॥
'O king, Kshatriyas demonstrate their valor through action rather than words. Therefore, speeches from a Kshatriya are never boastful, O descendant of Vrihadratha.' ॥ 2-19-47 ॥
english translation
kaSatriyò bAhuvIryasa tu na tathA vAkyavIryavAna apragalbhaM vacasa tasya tasmAda bArhadrathe samRtama ॥ 2-19-47 ॥
hk transliteration by Sanscript