Because we are all concerned with the feelings of consciousness, of happiness and distress. Everyone is embarrassed. Everyone is trying that, "I shall become happy in this way." So that means he is feeling distress. So according to Lord Buddha's philosophy, these feelings of happiness, distress, is due to this combination of matter. So you dismantle this matter, material, there will be no more distress, and nirvāṇa—finish. Nirvāṇa means finish.
But, I mean to say, further development. Śaṅkara, he says: "No, matter is not all. This is false. Matter has grown on the platform of spirit." Brahma satyaṁ jagan mithyā.
And the Vaiṣṇava ācārya said: "Yes, spirit is the basic principle. Matter is false. That's all right. But that spirit is not void. There is spiritual construction. As in the material world there is material construction, in the spiritual world there is spiritual construction." So that spiritual construction is not known to other philosophers than the Vaiṣṇava philosophers.