I think for most people the point of category theory can be one of these: http://en.wikipedia.org/wiki/Don%27t_repeat_yourself http://en.wikipedia.org/wiki/Don%

I think for most people the point of category theory can be one of these: http://en.wikipedia.org/wiki/Don%27t_repeat_yourself http://en.wikipedia.org/wiki/Don%27t_repeat_yourself ; or http://en.wikipedia.org/wiki/Algebraic_topology http://en.wikipedia.org/wiki/Algebraic_topology ; or http://en.wikipedia.org/wiki/Abstract_nonsense http://en.wikipedia.org/wiki/Abstract_nonsense ...but probably it's not so helpful to insist on more than one of these at a time. And I think it would be good if more writers would realize that.