Sentence examples for this alone from inspiring English sources

"this alone" is a grammatically correct phrase in written English.
It can be used to emphasize that the specific thing being mentioned is the only thing that is important or relevant. Here is an example: "This book, with its compelling storyline and breathtaking imagery, can easily transport you to another world. But, for me, it is not just the plot or the visuals that make this book special. It is the way the author weaves in thought-provoking themes of love and loss, reminding us that this alone is what truly makes us human."