“In the bird society, there are crows and swans, and crows are interested in places where filthy things are thrown. However, swans prefer nice clear water with lotus flowers, and it is in such places that they take their pleasure. Similarly, there are men who are like crows and men like swans. That is a natural division.” (Shrila Prabhupada, Teaching of Lord Kapila, Vs 12 Purport)