The law-abiding human beings are further divided into three groups: the karmīs, or fruitive workers, the jñānīs, or knowledge-seekers, and the bhaktas, or devotees. The karmīs are divided into two sections: the sakāma-karmīs, or fruitive workers who want to enjoy the results of their labor, and the naiṣkāma-karmīs, who renounce the fruits of action. The sakāma-karmīs are greedy after insignificant, transient happiness. They make progress in their mundane activities and enjoy the heavenly planets in the life hereafter, but all that enjoyment is temporary. Therefore the soul's real benefit evades them.
To attain true, eternal happiness, which comes only after the dissipation of material bondage, is the real benefit for the soul. Thus any path that does not lead the soul to strive for this supreme goal—eternal transcendental bliss—is considered useless. When eternal bliss is the goal of ritualistic activities (karma-kāṇḍa), then they are transformed into karma-yoga. Through the practice of karma-yoga, the heart is purified of material contamination and one gains knowledge of the Absolute. Thereafter one becomes situated in meditation on the Absolute, and finally one attains bhakti, pure devotional service. In the process of karma-kāṇḍa, it is recommended that one renounce physical pleasures for a time; so a karmī may sometimes be called an ascetic. Yet however much penance a karmī may perform, ultimately this penance is another form of sensual enjoyment, since that is its ultimate goal. The demons also perform penance to increase their powers, but it is all simply to enjoy their senses. Once the living entity can transcend the stage of hankering after sensual pleasures, he comes easily to the stage of karma-yoga, which is in all respects good. Only such a person can benefit society.
The spiritual progress the karma-yogī makes in this lifetime remains intact, and he continues in his next life from that point. In the Bhagavad-gītā (6.43), Lord Kṛṣṇa comments, "On taking such a birth, he revives the divine consciousness of his previous life, and he again tries to make further progress in order to achieve complete success, O son of Kuru." In his next life the unsuccessful yogī may be born in the family of a pious brāhmaṇa or wealthy merchant. When we talk of failure in yoga, we refer karma-yogīs, dhyāna-yogīs, and jñāna-yogīs. Among the followers of these paths, the karma-yogī is closest to becoming a pure devotee, since he has dedicated his activities to the Supreme Lord's service. Gradually, acting in this manner, he becomes a bhakta-yogī. Such a yogī is in the highest order, and he is fit to instruct all other yogīs.