People Are What They Are . . .

 . . . and they don't change. No doubt there are exceptions. Few and far between, they prove the rule.  As a rule of thumb, one most useful  in the art of living, assume that Schopenhauer was right in his doctrine of the unalterability of character. Never enter into an important relationship with a person, marriage for example, with the thought that you will change the person to your liking. That is highly unlikely. What will happen is that you will induce a change in yourself, one in the direction of frustration and disappointment.