What one can be depends on the self-image of oneself. Suppose that when you miss something and you regret for it, you think you are foolish and incompetent. And you are likely to be the one who you think. It can be said in the same way when you try to stop smoking or drinking alcohol. If you consider that you can't stop it, you never can. If you regard your defect as incurable, it can't be cured. On the contrary, if you regard it as curable, it is sure to be cured. The more fun you feel your job, the more pleasing the job get. About people who lament their old age. Their lives go ahead to ends from just the time they lament, . If, even in an old age, you consider the age as the genuine beginning of you life to utilize your experience, a wonderous power will catch you. The Japanese restler, Baba The Giant, said when he was interviewed on the birthday that he come to be 60 years old, "From now on I wanna train myself again". There were 80-or-90-years-old presidents who govern their countries. If you regard your body as 10 years younger than your real age, I guess in fact you can regain the youth as you regard. Those who regard themselves as evil do evil things unconcernedly. On the contrary, those who regard oneself as good do good things naturally. And they must be able to believe in god reasonably. Would you express on your words what you are ?