“The individual soul and the Supersoul are both compared to swans (hamsa) because they are white, or uncontaminated. One swan, however, is superior and is the instructor of the other. When the inferior swan is separated from the other swan, he is attracted to material enjoyment. This is the cause of his falldown.” (Shrila Prabhupada, Shrimad Bhagavatam, 4.28.64 Purport)