Motivations and world view are two intertwining issues.
People have some control over their motivations and this often depends on their world view.
When it comes to morality most philosophers are mostly interested in motivation. Schopenhauer thinks all motivations come under three headings: egoism, malice and compassion.
I there are more than just these three. And I think that they are to some degree subject to ones own choice.
But I also think that one can only follow a small number of principles. So while you might have open to you a number of principles or prime directives in your life, I do not think you can hop between them.
Each one of these people was apparently aware of the need to have a prime principle in ones life and also believed the choice of this prime directive is subject to choice. But they each choose a different prime directive not just for themselves but also to claim that thus and thus prime directive is the true one for all men.
This principle we find in political philosophy also. John Locke felt the protection of natural human rights is the proper Prime directive of government and that the way to protect peoples rights is by one main method-to protect their property from other people and from the government itself. To Hegel and Marx, this is all ridiculous and they have another basic principle for government--"the State" which embodies the General Will. All individual interest is to be subjected to the State. This is now sadly the acting principle of the American government in direct opposition to the Constitution. [I don't want this to be a polemical peeve because I have not decided against Marx at all. Sometimes I feel in a situation the playground is occupied by bullies that a large degree of power granted to the State by Marx is important.