puṣṇan na dharmeṇa vinaṣṭa-dṛṣṭiḥ
bhrātur yaviṣṭhasya sutān vibandhūn
praveśya lākṣā-bhavane dadāha
Dhṛtarāṣṭra was blind from birth, but his blindness in committing impious activities to support his dishonest sons was a greater blindness than his physical lack of eyesight. The physical lack of sight does not bar one from spiritual progress. But when one is blind spiritually, even though physically fit, that blindness is dangerously detrimental to the progressive path of human life.