Krishna is the Original Soul. If they were able, all souls could trace their ultimate origin to Krishna, the origin of everyone and everything. Just as the body has a soul within, so the soul also has a soul. The Soul of the soul is known as Atma-atma. But this Soul is never trapped or compromised as the individual soul is. This Soul remains ever free and above all. He is therefore known as the Over Soul or Superior Soul, or Supersoul, the Param-atma.
The individual soul has an innate attraction to the Paramatma and forever struggles to rediscover Him. That struggle spans an entire life. Then the life after that, and the life after that. Thousands of lives are passed searching for the source of the soul. Eventually, Krishna says ‘after many births and deaths,’ the soul comes to know that He, Krishna, is everything, and begins to directly recognise and acknowledge Him; to know and serve Him. This is bhakti, and the beginnings of divine love.