SB 9.10.51
tretayam vartamanayam
kalah krta-samo ’bhavat
rame rajani dharma-jñe
sarva-bhuta-sukhavahe
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Lord Ramacandra became King during Treta-yuga, but because of His good government, the age was like Satya-yuga. Everyone was religious and completely happy.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Among the four yugas — Satya, Treta, Dvapara and Kali — the Kali-yuga is the worst, but if the process of varnasrama-dharma is introduced, even in this Age of Kali, the situation of Satya-yuga can be invoked. The Hare Krsna movement, or Krsna consciousness movement, is meant for this purpose.
kaler dosa-nidhe rajann
asti hy eko mahan gunah
kirtanad eva krsnasya
mukta-sangah param vrajet
“My dear King, although Kali-yuga is full of faults, there is still one good quality about this age: simply by chanting the Hare Krsna maha-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.” (Bhag. 12.3.51) If people take to this sankirtana movement of chanting Hare Krsna, Hare Rama, they will certainly be freed from the contamination of Kali-yuga, and the people of this age will be happy, as people were in Satya-yuga, the golden age. Anyone, anywhere, can easily take to this Hare Krsna movement; one need only chant the Hare Krsna maha-mantra, observe the rules and regulations, and stay free from the contamination of sinful life. Even if one is sinful and cannot give up sinful life immediately, if he chants the Hare Krsna maha-mantra with devotion and faith he will certainly be freed from all sinful activities, and his life will be successful. Param vijayate sri-krsna-sankirtanam. This is the blessing of Lord Ramacandra, who has appeared in this Age of Kali as Lord Gaurasundara.