Even if it is difficult for you to chant, you can still chant in your mind. You can also hear. Listen to lectures. You were accustomed to using your body for Krishna, but now this is a new test to see if you've understood why all the previous service you rendered with your body and mind was aimed for the right goal. All of our duties are meant to increase our remembrance of Krishna, because remembrance of Him is what we must take with us when we leave these bodies behind. All our other achievements will not come with us.
(Collected Letters to My Disciples, Pg 167, 3rd Paragraph)