“A romance must make the "romantic relationship between the hero and the heroine ... the core of the book."(Berkley Group).

“My heart stopped. It just stopped beating. And for the first time in my life, I had that feeling. You know, like the world is moving all around you, all beneath you, all inside you, and you're floating. Floating in midair. And the only thing keeping you from drifting away is the other person's eyes. They're connected to yours by some invisible physical force, and they hold you fast while the rest of the world swirls and twirls and falls completely away." (Flipped)
"The books are about the celebration of falling in love and emotion and commitment, and all of those things we really want." (Nora Roberts).
“The main plot of a romance novel must revolve around the two people as they develop romantic love for each other and work to build a relationship together.”(Romance Writers of America).
what are these four quotes proving about the romance genre?

These four quotes are essentially providing evidence about the romance genre. They collectively suggest that romance novels prioritize the romantic relationship between the hero and the heroine, making it the central focus of the story. The quotes highlight the intense emotions and feelings experienced by the characters when they fall in love. They emphasize the importance of the connection between the two individuals and how it holds them together amidst the chaos of the world. Additionally, these quotes assert that romance novels celebrate love, emotion, and commitment, all of which are significant aspects desired by readers in the genre. Moreover, the quotes mention that the main plot of a romance novel revolves around the development of romantic love between the central characters and their journey of building a relationship. Overall, the quotes work together to demonstrate the key themes and elements that define romance as a genre.