The mystery of religious life is very, very secret. Secret means for ordinary man it is very difficult to understand. Therefore śāstra says tarko 'pratiṣṭhāḥ. If you want to learn what is spiritual life simply by your argument, dry, philosophical speculation, it will never be achieved. Tarko 'pratiṣṭhāḥ śrutayo vibhinnā. If you study the Vedas . . . there are different Vedas, principally Sāma, Yajur, Atharva, Ṛg— but you cannot understand the objective of the Vedas simply by studying yourself. Therefore Vedas says, Kaṭhopaniṣad, tad vijñānārthaṁ sa gurum evābhigacchet śrotriyaṁ brahma-niṣṭham samit-pāṇiḥ (MU 1.2.12). Like that. In every śāstra the injunction is if you want to understand the essence of Veda, then you must approach a realized, self-realized person. In the Bhagavad-gītā also the same thing is said. Tad viddhi praṇipātena paripraśnena sevayā (BG 4.34).
So Prahlāda Mahārāja, although he was born of a father who was atheist number one, godless, by the grace of Nārada Muni he became a great devotee. So his father was very careful that nobody comes and instructs his son about Vedic way of life or God consciousness, Kṛṣṇa consciousness. He was very careful not to allow anyone. He appointed teachers for his son, strictly prohibiting about . . . just like nowadays it has become . . . what is called? State? Secular state. "Don't talk of God." This is the present situation of the world, atheist class. "Don't talk of God."
But they do not know that they have not much improved by "Don't talk of God." The situation is becoming grimmer and grimmer. But they have no eyes to see. They have no eyes to see. This godless civilization will not make them happy. That's a fact. Harāv abhaktasya kuto mahad guṇa manorathena asato dhāvato bahiḥ (SB 5.18.12). If one is godless, then however qualified he may be from the material point of view, he is useless. Harāv abhaktasya kuto mahad guṇā. He cannot have any good quality. Why? Manorathena asato dhāvato bahiḥ. Because he is on the mental platform. So by speculation on the mental platform, he will accept which is not spiritual. Asata. Asato māṁ sad gamaḥ. That is the Vedic injunction. Don't keep yourself in the asata, but you try to transcend to the sat platform, oṁ tat sat. That means spiritual platform.
So those who have no spiritual knowledge, they are on the mental platform. There are many platforms of our life. Indriyānī parāṇy āhur indriyebhyaḥ paraṁ manaḥ manasas tu parā buddhir (BG 3.42). So ordinarily we are bodily, we think, "I am this body." This is called . . . body means my senses. So civilization based on this bodily concept of life are interested only sense gratification. That is their aim of life. Indriya-tarṣaṇāt, sense gratification. And those who are disgusted with sense gratification, they go little higher on the mental platform, mental speculation, just like philosophy, poetry, like that. Gross means they are working very hard day and night for sense gratification, just like hogs and dogs.