। ॥ ८७८ ॥
In plain words
The three samādhis you work at inside, in the heart — practise them out here too, in the world of places and things. Duality ends that way.
Close to the Sanskrit
Just as the threefold samādhi is performed with effort in the heart, so indeed it is to be performed in the external region also, for the cessation of duality.