नित्यम् always, शस्त्रम् weapon, परिवहन् while carrying, सः तपोधनः that sage, तपसि in penance, निश्चयम् his resolve, त्यक्त्वा after giving up, क्रमेण gradually, स्वाम् his, बुद्धिं intellect, रौद्रीम् fierce, चकार developed.

While the sage moved about holding the weapon, he gave up the practice of penance gradually and developed a violent mindset.