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. Naturally, if you are really compelled to be in bed without being able to move, with a terrible fever or a very serious illness, then that’s quite different. But otherwise, if you are just a little indisposed: “I am not feeling quite well, I have a little headache or I have indigestion, or I have a bad cold, I am coughing”, things like that—then doing your work, not thinking of yourself, thinking of the work, doing it as well as you can, that puts you right immediately.
In reality illness is only disequilibrium; if then you are able to establish equilibrium, this disequilibrium disappears. An illness is simply, always, in every case, even when the doctors say that there are microbes—in every case, a disequilibrium in the being: a disequilibrium among the various functions, disequilibrium among the forces.
Ref: Questions and Answers 1953