Commentary by Hazrat Inayat Khan:

Every being has an individual ego produced from his own illusion. This limits his view which is led in the direction of his own interest, and he judges of good and bad, high or low, right or wrong in relation to himself and others, through his limited view, which is generally partial and imaginary rather than true. This darkness is caused by the overshadowing of the soul by the external self. Thus a person becomes blind to his own infirmities as well as to the merits of another, and the right action of another becomes wrong in his eyes and the fault of the self seems right. This is the case with mankind in general, until the veil of darkness is lifted from his eyes.