This human form of life is meant for inquiring about our spiritual identity. That is real business. So in that line of thought we are manda. Manda means very slow. "All right. We shall take it later on. Now I have got strength. Let me enjoy senses. Then we shall see later on." That is called manda. Not serious.
But spiritual life is essential, it is very serious subject matter, that I am covered by this material body, and I am changing one after another. And I do not know what the next change is going to happen, either cat or dog or tree. We are not at all interested. You see? There is no such education in the university, the transmigration of the soul, the eternity of the soul, what is the aim of life. Therefore, mandāḥ sumanda-matayaḥ. Sumanda-mati. Their philosophy is still more bad. You see? They are simply thinking on the bodily concept of life.