Reference for Deuteronomy 7:11

One who walks along in his world without contemplating whether his ways are good or evil is similar to a blind man walking on the bank of a river. His danger is certainly very great and his calamity is more likely than his escape. For negligence in guarding oneself from danger due to natural blindness and negligence due to willful blindness, namely shutting one's eyes by choice and desire is one and the same.