Since the subject line suggests a user looking for a specific resource (likely a chapter or a popular PDF scan of Eugene Schwartz’s seminal book Breakthrough Advertising), the best approach is to create a post that adds value to that search rather than just providing a dry link.
Book Summary
In the digital age, Schwartz's work is more relevant than ever. As consumers are bombarded with an ever-increasing volume of advertising and marketing messages, the need to create effective, persuasive advertising that cuts through the noise has never been greater. eugene+schwartz+breakthrough+advertising+pdf+11+hot
The "Testimonial Ladder"
Use customer testimonials to climb credibility: Since the subject line suggests a user looking
Schwartz’s most famous contribution is the Five Stages of Awareness. He argued that your copy shouldn't start with your product, but with where your customer's mind is currently at. Hot Button: Simplification