This paper aims to establish the meaning of Dharma as the principle of self-denial and emptiness. Dharma, a key concept in the religious thought of India, has the literal meaning of "supporter.” Something that supports something else does not exist for itself. Just as the truth supporting the universe is Dharma, so the four pillars supporting the roof of the house to prevent it from collapsing are also Dharma. The four pillars supporting the house do not exist for themselves, but create an empty space in the house. In this respect, the essence of Dharma is self-denial, self-sacrifice. The traditional ascetic practices and religions in India is referred to as sanatana dharma (eternal truth), and the core is the complete extinction of I-ness (individual consciousness). When individual consciousness is completely lost, mokṣa (nirvana) is achieved. The moment the eternal truth is achieved, the individual consciousness becomes zero, and this position can be likened to the center (0) where the x- and y-axes meet in the coordinates of mathematics. Just as the center in the coordinates of mathematics is a place where the value of the x-axis is zero and the value of the y-axis is zero, the center of the universe, that is, nirvāṇa is achieved when individual consciousness is completely lost. Dharma is the path of becoming nothing to reach the zero point, and the process of self-denial is bound to entail pain. The pain involving voluntary self-denial can be rather a positive nourishment for the realization of Dharma. In fact, we can say that the core of the Hindu ethics of Aśrama-dharma (the 4 cycles of human life) and Varṇa-dharma (the caste system) is voluntary renunciation for the complete extinction of individual consciousness and renunciation concerning that which is possible.