The demonic people, they do not have the truth. Only a false theory, the Darwin's theory. We have commented upon Darwin's theory also in our book Scientific Basis of Kṛṣṇa Consciousness. Dr. Svarūpa Dāmodara Brahmacārī, he has written a small booklet. He has criticized Darwin very strongly, that he is a speculator. A speculator cannot give you truth. That is not possible. By speculation you cannot say, "Two plus two equal to five." That is not science. "Two plus two equal to four," that is everywhere. And if you speculate, "No, two plus two equal to five," or "Two plus two equal to three," that is not science. So scientific basis means it should be fact, not speculation. Mano-dharma, mano-dharma means speculation.
Therefore śāstra says, harāv abhaktasya kuto mahad-guṇā mano-rathenāsati dhāvato bahiḥ (SB 5.18.12). Harāv abhaktasya, one who is not a divine nature or devotee of the Lord, he has no qualification. "Oh, he's M.A., Ph.D." No, he has no qualification. "Why?" Now, mano-rathena, he is simply speculating. He has no truth. How by speculation . . .? Every one of us, we are imperfect. We are very much proud of our eyes: "Can you show me?" What qualification your eyes have got that you can see? He does not think that, that "I have no qualification; still, I want to see." These eyes, oh, they are dependent on so many condition. Now there is electricity, you can see. As soon as there is electricity off, you cannot see. Then what is the value of your eyes? You cannot see what is going on beyond this wall.