Vital Disturbances

The exacerbation of certain vital movements is a perfectly well-known phenomenon in Yoga and does not mean that one has degenerated, but only that one has come to close grips instead of to a pleasant nodding acquaintance with the basic instincts of the earthly vital nature. I have had myself the experience of this rising to a height, during a certain stage of the spiritual development, of things that before hardly existed and seemed quite absent in the pre-Yogic life. These things rise up like that because they are fighting for their existence—they are not really personal to you and the vehemence of their attack is not due to any “badness” in the personal nature. I dare say seven sadhaks out of ten have a similar experience. Afterwards when they cannot effect their object which is to drive the sadhak out of his sadhana, the whole thing sinks and there is no longer any vehement trouble. I repeat that the only serious thing about it is the depression created in you and the idea of inability in the Yoga that they take care to impress on the brain when they are at their work. If you can get rid of that, the violence of the vital attacks is only the phenomenon of a stage and does not in the end matter.

Ref : Letters on Yoga Vol. IV