Kṛṣṇa says, śamo damas tapaḥ. This śamo damaḥ, how it can be practiced without tapasya? It is so easy thing that you can control your mind and senses? But with tapasya. You must agree. That is human life. Tapo divyaṁ putrakā yena śuddhyet sattvam (SB 5.5.1). Ṛṣabhadeva was advising His sons, "My dear boys, this human form of life is meant for tapasya, tapo." What for tapasya? Divyam, to realize the Supreme, deva. Why it is required? Tapo divyaṁ putrakā yena śuddhyet sattvam: "Your existence will be purified if you practice tapasya." "Now what is my existence? Am I impure?" Yes. Therefore you are dying. Otherwise you are eternal. Na hanyate hanyamāne śarīre (BG 2.20). You, eternal, but you are dying. You are subject to death because your existence is impure.
Therefore, tapo divyaṁ putrakā yena śuddhyet yasmād brahma-saukhyam anantam. If you want really blissful life eternally, then you must come to the eternal existential position, platform. Yasmād brahma-saukhyam anantam. To become happy, to become joyful, that is your right because you are part and parcel of Kṛṣṇa, God. He is sac-cid-ānanda-vigrahaḥ (Bs. 5.1). You are part and parcel. So you are now fallen. You are trying to get that blissful life, but you are trying falsely, falsely, in a platform where there is duḥkhālayam aśāśvatam (BG 8.15). It is not possible. You come to the spiritual platform. You come to your original consciousness. Then your sattva, your existence, will be purified and you will enjoy. Enjoyment is your right. So therefore this śamo damaḥ can be practiced, provided you agree to execute tapasya, tapasya.