Get post content, only text

Hi!
First, sorry for my poor English !
I want to get the content or the excerpt for each post in post list and I use the DIVI theme with page builder. Each post page contains sidebar element and one text element with the post description. How can I get THIS description and not all the content?
I get posts using query_posts($args); but the_content(); display everything and not just the description…

Thank you !