Swami Sivananda places ethical discipline at the very heart of spiritual life, and he does so by repeatedly returning to the classical framework of Yama and Niyama. The restraints (Yamas) he emphasizes are non‑violence (ahimsa) in thought, word, and deed; truthfulness (satya) and honesty in all dealings; non‑stealing (asteya); chastity or control of sexual energy (brahmacharya); and non‑covetousness or freedom from greed and unnecessary possessions (aparigraha). These are not presented merely as social virtues, but as indispensable safeguards that prevent the dissipation of energy and the coarsening of consciousness. Without them, higher practices in yoga and Vedanta remain unstable, because the mind is continually disturbed by remorse, agitation, and unfulfilled desire.

Complementing these restraints are the observances (Niyamas), which Swami Sivananda holds up as the positive cultivation of a divine way of living. He stresses purity (saucha) of body, mind, and surroundings; contentment (santosha) and a quiet acceptance of circumstances; austerity (tapas) as disciplined effort and the willing endurance of hardship; self‑study (svadhyaya) through scriptures and introspection; and surrender to God (Ishvara‑pranidhana), dedicating all actions and thoughts to the Divine. These observances refine the inner instrument, turning daily life itself into a field of sadhana. In this way, ethical observance is not a mere preliminary but an ongoing, living expression of spiritual aspiration.

Alongside this classical structure, Swami Sivananda repeatedly highlights certain virtues as the living fragrance of genuine practice. Compassion and selfless service to all beings, humility and the elimination of ego, and the cultivation of patience, forgiveness, and love are treated as concrete signs that spiritual effort is bearing fruit. He counsels speaking kindly and avoiding harsh or injurious speech, simple living and the reduction of desires, and the deliberate avoidance of anger, hatred, jealousy, and similar negative emotions. Regular meditation and prayer are also upheld as ethical disciplines, since they steady the mind and orient it toward the highest good. Ethical precepts, in this vision, are not external rules but the natural expression of a heart purified and turned toward Self‑realization.