But there’s more: I think the weaker person is actually affected by the things he believes have power over his life. He is drawn toward, tempted by, those things he is afraid of. What that means is that he will be more likely to act on them, more likely to be hurt by them, than the strong person. The strong person has no fear of those things and is, therefore, less attracted to them.
It seems to me that it is because of this attraction that the stronger brother ought to be careful around the weaker. The weaker brother is more open to damage and addiction, simply because he believes these things have power. The stronger can have a glass of wine at dinner, for example, but he must remember that his weaker brother sees the alcohol quite differently.