तंत्रवार्तिक - कृष्णशुक्ल विवेक

महताऽपि प्रयत्नेन तमिस्रायां परामृशन् |
कृष्णशुक्लविवेकं हि न कश्चिदधिगच्छति ||

- तंत्रवार्तिक

In pitch darkness, one can not know the difference between white or black no matter how hard you try. The same difficulty exists when trying to know right from wrong if you are in the darkness of ignorance.

- Tantravartika