Width of a page that contains mostly text

I’m working on a design for a blog. The blog is very text oriented. It contains long articles of thousands of words.

When I look around the web I see that blogs often have a ‘fixed width’ page size (when using Blogspot or WordPress for example). But when I look at Wikipedia which is also very text heavy, it’s responsive and the text is spanned at almost the monitor width.

So what would be a good approach for a heavy text based blog which will be mostly read on desktops? Go full width (responsive) or limit the width?