Fits of despair and darkness are a tradition in the path of sadhana —in all Yogas oriental and occidental they seem to have been the rule. I know all about them myself—but my experience has led me to the perception that they are an unnecessary tradition and could be dispensed with if one chose. That is why whenever they come in you or others I try to lift up before them the gospel of faith. If still they come, one has only to get through them as soon as possible and get back into the sun.
Ref: Letters on Himself and Ashram