I am not saying this to discourage you, but to give you patience and perseverance—for there is a moment when you do arrive. And note that the vital is a small part of your being—a very important part, we have said that it is the dynamism, the realising energy, it is very important; but it is only a small part. And the mind!…which goes wandering, which must be pulled back by all the strings to be kept quiet! You think this can be done overnight? And your body?… You have a weakness, a difficulty, sometimes a small chronic illness, nothing much, but still it is a nuisance, isn’t it? You want to get rid of it. You make efforts, you concentrate; you work upon it, establish harmony, and you think it is finished, and then…. Take, for instance, people who have the habit of coughing; they can’t control themselves or almost can’t. It is not serious but it is bothersome, and there seems to be no reason why it should ever stop. Well, one tells oneself, “I am going to control this.” One makes an effort—a yogic effort, not a material one—one brings down consciousness, force, and stops the cough. And one thinks, “The body has forgotten how to cough.” And it is a great thing when the body has forgotten, truly one can say, “I am cured.” But unfortunately it is not always true, for this goes down into the subconscient and, one day, when the balance of forces is not so well established, when the strength is not the same, it begins again. And one laments, “I believed that it was over! I had succeeded and told myself, ‘It is true that spiritual power has an action upon the body, it is true that something can be done’, and there! it is not true. And yet it was a small thing, and I who want to conquer immortality! How will I succeed?… For years I have been free from this small thing and here it is beginning anew!” It is then that you must be careful.
Ref: Questions and Answers (1950 – 1951)