We go blind to things around us, some are naturally blind, others are accidently blind, some are voluntarily blind, and others are blind from inside.
Those who are blind from outside may not have control over this anomaly, however, being blind inside is a serious problem. Because being blind inside takes away the power not just to see but also to hear, feel, taste, smell and think. This is the darkness which consumes all the positivity from life.
I am not going to lecture on who is blind inside and why one should not be and how can one not be. But just wanted to define it or distinguish it from other forms of blinds.