Rule: Making bold claims will strengthen your writing only if you support the claims with textual evidence. A lawyer can't say, "My client is innocent," and walk out of the room with a not guiltyverdict. First, she has to support her claim with evidence. Your job as a writer demands the same support, only yours will come from the text rather than from a crime scene.
Examples:
Wrong: Daisy melts down during her first visit to Gatsby's house.
Better: Daisy melts down during her first visit to Gatsby's house. In fact, when Daisy sees Gatsby's shirts, she sobs, "They're such beautiful shirts" (118)
Wrong: IM wakes up lost and afraid.
Better: IM wakes up lost and afraid. After looking around, he notes, "My eyes were swimming with tears. Why, I didn't know. It worried me" (238).
Practice making bold claims that you could support with textual evidence:
Resources for further explanation about supporting claims with evidence:
The Writing Center at UNC-Chapel Hill's Evidence
Indiana University's Writing Tutorial Service's Incorporating Evidence Into Your Essays
University of Maryland University College's Paragraph Structure