Ārṣeya Upaniṣad p2

p2

tadu ha jamadagnirnānumene ārtamiva vā eṣa tanmene yadidamantareṇainadupayaṃti paryāsa ivaiṣa divaspṛthivyoriti | sa hovāca antarikṣaṃ vā etadyadidamitthetthopavyākhye iti | mahimānaṃ tvamuṣyeha paśyāmīti yadidamasminnanvāyattamiti | sa yadidametasminnanvāyattaṃ vedātha tathopāste'nvāyatto haivāsmin bhavati | tadetadavidvānevāsminnanvāyattamupāste vīvapadyat ārtimṛcchet | tasmādevamevopāsīta ||

Jamadagni did not agree with that. He considered it as though vulnerable, because they approach it between these two, saying, "This is like an inversion of heaven and earth." He said: "This is indeed the atmosphere, which you have thus explained. But I see here the greatness of that [brahman], which is attached to this. Whoever knows that which is attached to this, and then meditates on it as such, becomes indeed attached to it. But he who, without knowing this, meditates on [what is merely] attached to it, perishes and comes to ruin. Therefore one should meditate on it only thus."