I apologize for upsetting you. I have experienced severe depression myself, and have come out of it very well after many many years in that state. I have also spent decades studying the condition and have tested my theory with dozens of people who have recovered.
I think it is a matter of words that my way of expressing my thoughts was not suitable.
The point was that when you are depressed, the true cause may not be found or it may be different than you think.
I expressed it as a lack of a fundamental and deep purpose to life being unfulfilled. In some cases, a person had a talent, skill or simply a personality that was not being expressed. thus they have been constrained. Being constrained into a life like that is tantamount to a lion being kept in a small cage in a zoo. The lion will become depressed. I chose the word bored as that can be a way of explaining why the lion is depressed, he is bored with being in a cage rather than living as he is destined to in the free.
certainly there are cases which i have dealt with that have been classified as neurological and psychological disorders, however for example, one case of a man who had over 10 years of severe depression, classified as incurable, under heavy medication, was no longer depressed and actually very happy in a few days after a certain change in his life and no longer required medication. When he returned to his previous conditions, his depression returned. It was not a simple change of environment alone, it was a change in his lifestyle and what he was doing day to day.
His history was that he was a naturally talented scholar and teacher. He was a very gregarious person, great sense of humor, very social, all good things a person could want to be. Then he experienced a series of emotional traumas and let downs with parents and then a very bad wife. This was then followed by a tremendous injustice in his teaching position in the college. The series of events added up to his breaking point at which time he became a recluse, no longer having any social interactions because he was so discouraged with humanity. Normally discouraging events can heal, however his decision to become a recluse became the new cause of his depression. Because he did not see that as being the cause but maintained that it was the discouragements of life which put him in his hole, and that he felt medication is the only way to help him, he did not discover that he had actually healed from the initial causes of his pain and that there was a new cause to the depression, that being his isolation.
In his depression, he was isolated, the change that brought him out of it was a change of environment as well as placing him on stage to be teaching again. He returned to his natural talent, or I you would permit the word, his destiny.
What I am proposing here, is that what is often the cause of a severe depression is a person living a life which is in lack of harmony with their true nature, denying their natural personality, talents and abilities. Some events happen which turn a person away from their nature and it could even be so strong that they forget or deny that nature totally. They can further increase the depression by following this altered course of living. Making a change in their lifestyle, which is often a very difficult thing to do, is an answer.
Simply put, my experience personally and with many case studies I have conducted, a high percentage of cases of depression are maintained by an unrealized cause, and that by altering the life style completely in the direction of a persons natural talents, a person can eliminate the depression without medication. However this may entail a complete change of lifestyle, environment, associations etc. The question is to what extent a person is willing to go to come out of the hole. Sometimes it could be very simple, but it is worth a try.
For myself, I was prepared to kill myself. Then I thought about the spiritual teachings which say how that is the worst thing for the soul, and by the way I am not at all religious. I was not so concerned at that point, but I thought, change may be better. I made a total change of lifestyle that changed my internal life so much that it was well worth the cost. The point is that the cure is often simple but illusive but is there. It makes no sense that anyone is destined to remain depressed in that degree, there must be a natural way out.