adi shankaracharya

 Ignorance of the soul is the cause of our error of conceiving distinctions between things; but knowledge of the identical soul and the reality of things put an end to all distinctions. Distinctive knowledge of existences (bheda jñāna) is erroneous, but their generalization (abheda jñāna) leads to right reasoning.

They call it ignorance (avidya) when the intellect is vitiated by its acceptance of phenomena (cetya), but phenomena being left out, the intellect comes to know the soul which is free from all attributes. The mind wraps the inner soul with the coverlet of its various desires, just as the silkworm twines the thin thread of its desires round about itself, which its lack of reason prevents it from understanding.

aum satcitekam brahmā ~ “Om, the ultimate reality is truth, consciousness, and one without a second.”