This does not mean, however, that the unfavourable results of the parental mistakes cannot be remedied later in life. There is reason to believe that, even in most extreme cases of morbid doubting--except the comparatively few cases where organic brain disease is responsible for the doubting--it is possible to effect a cure. As has been said, both of these patients were cured, and their cases may be regarded as fairly typical of this variety of mental affliction at its worst. Accordingly, when the tendency to trivial doubts is less marked, there is the possibility not only of cure, but of self-cure, provided that the doubter recognises exactly wherein he is deficient. Self-consciousness, timidity, distrust of self, a conscious or subconscious feeling of inferiority, and often a lack of physical vigour--these are the elements that chiefly contribute to the growth of a tendency to anxiety and indecision about trivial things; these are the weaknesses that specially need to be overcome. As a preliminary measure, the doubter should make it a rule to take exercise daily in the open air, and to see to it that his living and sleeping quarters are kept well ventilated. Indecision, even in the most energetic of men, is frequently a resultant of deprivation of fresh air. To reach decisions, to settle doubts quickly, a well-nourished brain is indispensable. And no brain can be well nourished unless the blood flowing to it is amply supplied with oxygen. Of all persons, therefore, the habitual doubter is in need of plenty of fresh air and of physical exercise to build up his organism as a whole and increase his powers of resistance to fatigue. For the same reason, he needs an abundance of good food. Physical upbuilding, moreover, will have the desirable effect of increasing his power of concentrating attention on some serious life interest. This, above everything else, is what the doubter needs to do. He must develop an ardent interest in something worth while--his work, a useful hobby, occupation of some sort. The trivial doubter--the doubter of any kind--is pre-eminently a man or woman devoid of a keen life interest. If a life interest were present, there would be neither time nor inclination to dissipate energy in useless doubting. If you, my reader, recognise in yourself one of the doubting kind, you will appreciate the truth of this. You will admit that you have little enthusiasm for your work, little interest in anything that would keep you from being too occupied with thoughts of self.