By study of Srimad-Bhagavatam under the bona fide spiritual master, one becomes aware of the full value of life, and then he revives his original Krishna consciousness. That is the perfection of life. The individual soul is already under specific material nature, and the process is going on in lower grades of life, but in the human form of life by advancement of education, one can become above the modes of material nature. That chance is given to him. This is stated in the Bhagavad-gita: "yanti deva vrata devan [Bg. 9.25].'' So if he likes he can go back to Godhead, "yanti mad yajino 'pi mam,'' and stop this transmigration process. Then he comes again perfect in Krishna consciousness.
Letter to Svarupa Damodara das, 31 August, 1975