Dallas Willard wisely instructs his readers on the nature of feelings:
Much of the great power of feelings over life derives not just from the fact that they touch us, move us, but from the fact that they creep over into other areas of our life; they pervade, they change the overall tone of our life and our world. They spread like an unstable dye or a viral form or a yeast. They may take over all else in us, even that to which they have no relevance. Things and people around us then look different, take on a distinctive tone or meaning. And that can even determine the tendency and outcome of our life as a whole.
This explains why it is so hard to reason with some people. Their very mind has been taken over by one or more feelings and is made to defend and serve those feelings at all costs. It is a fearful condition from which some people never escape. We have noted how thoughts generate feelings. If we allow certain negative thoughts to obsess us, then their associate feelings can enslave and blind us—that is, take over our ability to think and perceive. …
Beyond the individual level, poisonous emotions and sensations often take over entire social groups, blinding them and impelling them on terrible courses of destruction. This is nearly always what has happened in cases where repression of ethnic groups or genocide occurs. Thus, to the onlooker the participants (the Nazis, and so on) seem to be deaf, blind, and insane – which, in a sense, they are. They, too, are imprisoned.
Feelings can be successfully “reasoned with,” can be corrected by reality, only in those (whether oneself or others) who have the habit and are given the grace of listening to reason when they are expressing violent feelings or are in the grip of them. A feeling of sufficient strength may blot out all else and will invariably do so in one who has not trained himself or herself, or been trained, to identify, to be critical of, and to have some distance from his or her own feelings. Combined with a sense of righteousness, strong feeling becomes impervious to fact and reason. …
Abandonment to feeling, allowing oneself to be “carried away” by feeling, is actually sought by many, and on a regular basis. That is a testimony to our epidemic deadness of soul. People want to feel, and to feel strongly, and in the very nature of life they need to do so
The opposite of peace is really not war, but deadness. The “dead soul” is one waiting to explode or fall apart, and one that will seek out trouble for reasons it cannot understand. In its desolate life away from God, there is no drama to provide constructive feeling tones that would keep life from being a burden. Such persons really have no hope. This is the key to those “lives of quiet desperation” Thoreau attributed to “most men.” Feeling will then be sought for its own sake, and satisfaction in feeling alone always in turn demands stronger feeling. It cannot limit itself. [Renovation of the Heart, 124-125]