In plain words
In that way, all of these are reckoned as aiśvaryas indeed. Not only this: one can bind by Jñāna too. That is precisely why they called God one who is in the power of His devotees. Because the devotee binds God with Bhakti, He has passed wholly into the devotee's keeping. Whoever gains Jñāna and takes on the form of jñātā and jñeya stays absorbed in the Ānanda of that state. Such a one they have been describing in the manner of ‘tadevatvaṃ’. Tadevatvaṃ means that he stays in a kind of Ānanda, gains Jñāna and is himself in the very form of the jñeya. But the jñātā, looking on the jñeya, in Ānanda, also goes on to some extent inquiring into what is called ‘Tat’. Just such a one they called ‘tvadevatat’. When we inquire into the difference between the two, ‘tvadevatvaṃ’ and ‘tvamevatat’, the one place is the guru's and the second place is the disciple's. That is, the one who sits in the place of Tat and teaches the tvam rightly is the guru. The one who himself sits in the place of tvam and inquires into the nature of Tat is the disciple. So the guru is one who stands in the place called Tat. The one who lives close to that Tat is the disciple. So to the disciple who moves about right near, only good feelings must come. When he develops those good feelings, he comes to the state where the guru and he become one, and through that there is the chance to merge in nivṛtti. Whatever we are near, its nature must become ours. Only then is there real meaning in having been near it. And to explain a second thing to you: in our Bhārata, as people worship God, it is natural for things like keeping fasts and doing upāsana to go on. We must take the meaning of this, of what is called upāsana and upavāsa, properly. Upa: near; vāsa: dwelling. To dwell near is upavāsa. Upāsana: to sit near is upāsana. But what is the result that comes to us from sitting near like this? When we are sweltering, when it is very hot, we switch on the air condition, or else go to a cool place. And the result of sitting near the air condition is that the heat which was troubling us goes away and we are able to receive a coolness that gives us comfort.