Vital Reactions

A vital reaction means a response of the vital to the touch or pressure of an idea, action, event, person or thing.

E.g. if someone speaks something you do not like and you get angry, that is a vital reaction. Or if a woman passes and you feel sexual desire, that is a vital reaction. Or if something unpleasant happens and you get a depression, that is a vital reaction. Most disturbances of the consciousness are due to vital reactions, though the mind may assist by wrong thoughts and judgments and misinterpretations. There can be good vital reactions as well as bad, but the term is usually applied to those that are undesirable and have to be surmounted by the sadhak.

The ideal condition is that of a calm, clear, strong vital free from the reactions of the vital ego and responding with true and high feelings only that are acceptable to the spiritual will and the psychic being.

Ref : Letters on Yoga Vol. IV