If it is a work that you are doing for the collectivity and not for yourself personally, then you must do it, whatever happens. It is an elementary discipline. You have undertaken to do this work or have been given the work and have taken it up, therefore you have accepted it, and in that case you must do it. At all times, unless you are absolutely ill, ill in the last degree and unable to move, you must do it. Even if you are rather ill, you must do it. An unselfish work always cures you of your petty personal maladies.
Ref: Questions and Answers 1953