anyathā tv ācaran loke
garhito yāsyase tamaḥ
tasmāt samatve vartasva
pāṇḍaveṣv ātmajeṣu ca
anyatha -- otherwise; tu -- however; acaran -- acting; loke -- in this world; garhitah -- condemned; yasyase -- you will attain; tamah -- darkness; tasmat -- therefore; samatve -- in equanimity; vartasva -- remain situated; pandaveshu -- toward the Pandavas; atma-jeshu -- toward your sons; ca -- and.
Dhritarashtra's whole problem was his excessive attachment to his nasty sons. That was the fatal flaw that caused his downfall. There was no lack of good advice from all sides, and Dhritarashtra even admitted that the advice was sound, but he could not follow it. One can have clear, practical intelligence when the mind and heart are pure.