In the absence of king's protection Brahmanas would never study the four Vedas or practise austerities or be purified by knowledge and rigid vows.
ब्राह्मणाश्चतुरो वेदान् नाधीयोरंस्तपस्विनः। विद्यास्नाता व्रतस्नाता यदि राजा न पालयेत्॥