There are two classes of men. Some of them are full of polluted material things within their hearts, and some of them are materially free. Kåñëa consciousness is equally beneficial for both of these persons. Those who are full of dirty things can take to the line of Kåñëa consciousness for a gradual cleansing process, following the regulative principles of devotional service. Those who are already cleansed of the impurities may continue to act in the same Kåñëa consciousness so that others may follow their exemplary activities and thereby be benefitted. Foolish persons or neophytes in Kåñëa consciousness often want to retire from activities without having knowledge of Kåñëa consciousness. Arjuna's desire to retire from activities on the battlefield was not approved by the Lord. One need only know how to act. To retire from the activities of Kåñëa consciousness and to sit aloof making a show of Kåñëa consciousness; is less important than actually engaging in the field of activities for the sake of Kåñëa. Arjuna is here advised to act in Kåñëa consciousness, following in the footsteps of the Lord's previous disciples, such as the sun-god Vivasvän, as mentioned hereinbefore. The Supreme Lord knows all His past activities, as well as those of persons who acted in Kåñëa consciousness in the past. Therefore He recommends the acts of the sun-god, who learned this art from the Lord some millions of years before. All such students of Lord Kåñëa are mentioned here as past liberated persons, engaged in the discharge of duties allotted by Kåñëa.