In this verse, the words dharmah and sanatanah are very important. Sanatana means eternal, and dharma means occupational duties. From Satya-yuga to Kali-yuga, the principles of religion and occupational duty gradually deteriorate. In Satya-yuga, the religious principles are observed in full, without deviation. In Treta-yuga, however, these principles are somewhat neglected, and only three fourths of the religious duties continue. In Dvapara-yuga only half of the religious principles continue, and in Kali-yuga only one fourth of the religious principles, which gradually disappear. At the end of Kali-yuga, the principles of religion, or the occupational duties of humanity, are almost lost. Indeed, in this Kali-yuga we have passed through only five thousand years, yet the decline of sanatana-dharma is very prominent. The duty of saintly persons, therefore, is to take up seriously the cause of sanatana-dharma and try to reestablish it for the benefit of the entire human society. The Krsna consciousness movement has been started according to this principle. As stated in Srimad-Bhagavatam (12.3.51):