(Click to enlarge photo of Srila Prabhupada)
"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 Kṛṣṇa consciousness immediately becomes cleansed of all dirty things within and without. Kṛṣṇa is therefore known as Hari. Hari means 'he who takes away.' Kṛṣṇa immediately takes away all unclean habits from anyone who takes to Kṛṣṇa 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 Kṛṣṇa 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. 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 small aquatics living in the reservoirs, they cannot understand that their ponds 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 very much disturbed; they are exactly like uncontrolled persons who are always unhappy from being unable to enjoy life or maintain their family members. The muddy earth gradually dries up, and newly grown fresh vegetation begins to wither. Similarly, for one who has taken to Kṛṣṇa consciousness, desire for family enjoyment gradually dries up.
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 becomes free from disturbance 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 rainfall; 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 conserve the energy of the body for utilization in the advancement of Kṛṣṇa 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.
During the daytime in autumn, the sun is very scorching, but at night, due to the clear moonshine, people get relief from the day's fatigue. Similarly, a person who takes shelter of Mukunda, or Kṛṣṇa, can be saved from the fatigue of misidentifying the body with the self. Mukunda, or Kṛṣṇa, is also the source of solace for the damsels of Vṛndāvana. The damsels of Vrajabhūmi are always suffering because of separation from Kṛṣṇa, but when they meet Him during the moonlit autumn night, their fatigue of separation is relieved. When the sky is clear of all clouds, the stars at night shine very beautifully; similarly, when a person is actually situated in Kṛṣṇa consciousness, he is cleared of all dirty things, and he becomes as beautiful as the stars in the autumn sky. Although the Vedas contain instructions for pursuing knowledge (jñāna), for practicing mystic yoga and for engaging in karmic activities in the form of sacrifices, the ultimate purpose of the Vedas is stated in the Bhagavad-gītā: one has to accept Kṛṣṇa consciousness after thoroughly studying the Vedas. Therefore the clean heart of a devotee in Kṛṣṇa consciousness can be compared to the clean sky of the autumn season. During autumn, the moon looks very bright along with the stars in the clear sky."
(Kṛṣṇa Book Chapter 20)