Everything becomes naturally beautiful with the appearance of the autumn season. Similarly, when a materialistic person takes to Krsna consciousness and spiritual life, he also becomes as clear as the sky and water in autumn. The autumn season takes away the rolling of dark clouds in the sky as well as the polluted water. Filthy conditions on the ground also become cleansed. Similarly, a person who takes to Krsna consciousness immediately becomes cleansed of all dirty things within and without. Krsna is therefore known as Hari. "Hari" means "he who takes away." Krsna immediately takes away all unclean habits from anyone who takes to Krsna consciousness. The clouds of autumn are white, for they do not carry any water. Similarly, a retired man, being freed from all responsibility of family affairs (namely, maintaining the home, wife and children) and taking completely to Krsna consciousness, becomes freed from all anxieties and looks as white as clouds in autumn. Sometimes in autumn the falls come down from the top of the hill to supply clean water, and sometimes they stop.

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Similarly, sometimes great saintly persons distribute clear knowledge, and sometimes they are silent. The small ponds which were filled with water because of the rainy season, gradually dry up in autumn. As for the tiny aquatics living in the reservoirs, they cannot understand that their numbers are diminishing day by day, as the materially engrossed persons cannot understand that their duration of life is being reduced day by day. Such persons are engaged in maintaining cows, property, children, wife, society and friendship. Due to the reduced water and scorching heat from the sun in the autumn season, the small creatures living in small reservoirs of water are much disturbed; they are exactly like uncontrolled persons who are always unhappy from being unable to enjoy life or maintain their family members. Because of the appearance of the autumn season, the water of the ocean becomes calm and quiet, just as a person developed in self-realization is no longer disturbed by the three modes of material nature. In autumn, farmers save the water within the fields by building strong walls so that the water contained within the field cannot run out. There is hardly any hope for new rainfalls; therefore they want to save whatever is in the field. Similarly, a person who is actually advanced in self-realization protects his energy by controlling the senses. It is advised that after the age of fifty, one should retire from family life and should conserve the energy of the body for utilization in the advancement of Krsna consciousness. Unless one is able to control the senses and engage them in the transcendental loving service of Mukunda, there is no possibility of salvation.

Source: Book: Krishna, The Supreme Personality of Godhead by A.C.Bhaktivedanta Swami Srila Prabhupada)