The person who desires his own best interest should take shelter of a bona fide spiritual master. Filling his mind with faith, keeping free from enviousness and remaining fixed in devotion, the disciple should serve the spiritual master, whom he should regard as nondifferent from the Supreme Lord. For a brahmacārī, the primary duty is service to the spiritual master. The main duties for a householder are protection of living beings and sacrifice, for a vānaprastha austerities, and for a sannyāsī self-control and nonviolence. Celibacy (practiced by householders at all times except once a month when the wife is fertile), penance, cleanliness, self-satisfaction, friendship with all living beings and above all worship of the Supreme Personality of Godhead are duties meant for every jīva soul. One acquires firm devotion for the Supreme Lord by always rendering service to the Supreme Personality of Godhead through one’s own particular prescribed duty, by not engaging in the worship of any other personalities, and also by thinking of all creatures as the place of residence of the Supreme Personality of Godhead in His form as the Supersoul. The followers of the karma-kāṇḍa section of the Vedas can attain the planets of the forefathers and so on by their ritualistic activities, but if they become endowed with devotion for the Supreme Lord, then by these same activities they can achieve the supreme stage of liberation.