Sri Aurobindo
Letters of Sri Aurobindo
Volume IV - Part 3
Fragment ID: 15031
The seeds of these old illnesses remain in the subconscient after they are cured. So when the subconscient is being worked, an adverse push bringing a general depression may make them sprout up; but they can be counteracted by the Force if you are vigilant and persistent in your sadhana and not remain to trouble.