यथा जात्यैव कृष्णोर्थः शुक्लस्स्यान्न ह्युपायतः।। संशोद्ध्यमानापि तथा भवेन्मूर्तिर्न निर्मला ।। १२ ।।
Just as an object, naturally black, cannot become white by any means, so also the physical body does not become clean though it is scrubbed and cleaned.