Madhvaon Brahma Sūtra 2.4.18

For (the distinction between the Chief Prana and the Pranas who are organs, is (clearly drawn) in the Pautra- yana Sruti thus : “ Truly standing unmoved from where he is, the Chief Prana does all this, causes all this to be done, acts with strength, bestows strength on all this, supports all this and enables this to support; so they call him the powerful Lord. Now the organs of sense; they are not steady; they do nothing ; they cause nothing to be done; they are not strong, cannot bestow strength (on other things); they do not support or enable others to support j hence these are really the weak and therefore they say that the senses are instruments.”