A journalist may use information from another source as long as the cite it within the text or media outlet. They can cite the source by giving credit to the original author. For example, when writing a nonfiction book you may need to look in other books for the facts you need to include in your book, therefor you would have to include the book name and author after or around the information you used.
He is saying to not judge a person before knowing them properly. To understand the perpectives of people that face things like discrimination and not to have bad opinions on them.
