So we have to see through the authorized books the description which is beyond our perception. Acintyāḥ khalu ye bhāvā na tāṁs tarkeṇa yojayet. Tarkeṇa, by argument, which is beyond your sense perception. So many things. Even we see daily so many planets, stars in the sky, but we have no information. They are going directly to see the moon planet, but hopelessly coming back. It is very doubtful to say so. And they have got dogmatic impression: "Except this planet, in other planets, so many, there is no life." These are not perfect understanding. From śāstra-yoni, if you want to see through the śāstra... Just like moon planet. We have got information from Śrīmad-Bhāgavatam that there, the people, they live for ten thousands of years. And what is that measurement of year? Our six months equal to their one day. Now such ten thousands of years, just imagine. It is called daiva-varṣa. Daiva-varṣa means year according to the demigods' calculation. Just like Brahmā's day, that is demigods' calculation. Sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ (BG 8.17). We have got information from Bhagavad-gītā, Kṛṣṇa says that they calculate the years of the demigods. Everyone's year is calculated. This is called... This is accepted by the modern science, relative truth or the law of relativity. A small ant, he has got also hundred years' age, but the ant's hundred years and our hundred years different. This is called relative. According to your size of body, everything in relationship. Our hundred years and Brahmā's hundred years, that is different. Therefore Kṛṣṇa said calculate like this: sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ (BG 8.17).
Now you try to understand what is the age of Brahmā by calculating one day. Your sahasra-yuga, we have got four yugas, Satya, Tretā, Dvāpara, Kali—these are called four... This calculation is forty-three hundred thousands of years. That is the sum total of the four yugas. Eighteen, twelve, eight, and four. How many it comes? Eighteen and twelve? Thirty, and then eight, thirty-eight, then four. This is rough calculation. Forty-two, forty-three. Sahasra-yuga-paryantam. So so many years, sahasra-yuga-paryantam ahaḥ. Ahaḥ means day. Sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ (BG 8.17). This is the one day of Brahmā. One day means morning to evening. Forty-three hundred thousands of years your calculation. Therefore these things are to be understood through the śāstra. Otherwise, you have no knowledge. You cannot calculate. You cannot go to Brahmā, you cannot go even to the moon planet. And what to speak of Brahmaloka is the ultimate, the remotest part of this universe. So by your direct experience, you cannot calculate, and neither you can go. They estimate, the modern aeronautics, they estimate, that in order to go to the topmost planet will require forty thousands of years by going in the light year. Just like light year, we have got calculation.
So we cannot estimate by direct perception, even in this material world, and what to speak of the spiritual world. Not (possible.) Panthās tu koṭi-śata-vatsara-sampragamyo vāyor athāpi manaso muni-puṅgavānām (Bs. 5.34). By mental, muni-puṅga means mental speculation. You can go on mental speculating, but if you do even for many hundreds and thousand of years, it is not possible to calculate. You have to accept this truth through the śāstra; otherwise, it is not possible. Therefore Kṛṣṇa said, nityasyoktāḥ śarīr-ukta. Ukta means it is said. Not that "I am presenting some dogma," although He can do so. He's Supreme Personality of Godhead. This is the method. Unless there is ukta, said by authorities, previous authorities, ācāryas, you cannot say anything. This is called paramparā. You try to understand with your intelligence, but you cannot make any addition or alteration. That is not possible. Therefore it is called nityasyoktāḥ. It is said, it is already settled. You cannot argue. Nityasyoktāḥ śarīriṇaḥ anāśino 'prameyasya, immeasurable.
Now, this soul, as in the previous verse we have understood, avināśi tu tad viddhi yena sarvam idaṁ tatam. This is not measurement of the soul, but the power of the soul you can measure. But not the soul. It is not possible. Soul is so small that it is not possible. You have no measuring means, and because now our material senses, it is not possible. You can simply understand by consciousness. Just like when Caitanya Mahāprabhu fainted in the Jagannātha temple, Sarvabhauma Bhaṭṭācārya examined that there was no consciousness. Even the abdomen was not moving. When you actually you have consciousness and you breathe, the abdomen moves. But Caitanya Mahāprabhu's abdomen was tested by Sarvabhauma Bhaṭṭācārya. It was also not moving. So he thought that "This sannyāsī might have died." But he again tried. He brought a little cotton swab and put before His nostril, and when he saw the swab, the fibers little moving, then he became hopeful, yes. So everything has got a different type of calculation, measurement. But so far the soul is concerned, it is said here, aprameyasya, there is no source of measurement. There is no source. Therefore, the so-called materialist science, they say there is no soul. No, there is soul. This is the proof there is soul. This is the proof. What is that proof? First of all there is consciousness. This is the proof. But you cannot measure. The place is also located. The soul is there in the heart. Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati (BG 18.61).