You almost certainly don't want to have the complete text on the list page as well as the page of the full text.
Let me explain that:
Say you are writing a blog and you have a one page for each article and you also have a homepage showing the last 10 articles. On your homepage you want to show only a snippet of each article and a "read more" link.
What I would do: Show the snippet on the list page with the "read more" link and nothing more. Your keywords/SEO/content will be on the page with the full text. Push the users to the article page if they want to read the article - it's a static, linkable URL that should have a unique title and meta tags for full SEO potential. Your list page changes when new stuff is added.