एष उ एव बृहस्पतिर्वाग्वै बृहती त-स्या एष पतिस्तस्मादु बृहस्पतिः ॥ २० ॥
In plain words
This very prāṇa is Bṛhaspati. Speech is indeed the Bṛhatī meter, and of that speech prāṇa is the lord; therefore he is Bṛhaspati.
Close to the Sanskrit
This one indeed is Bṛhaspati. Speech verily is Bṛhatī; of that this one is the lord, therefore indeed Bṛhaspati.