Bite-size: When forming (or changing) an attitude, our judgments involve different cognitive processes: people either do a lot or very little thinking. The depth of your message should match.
Full-size:
The central route of processing, which requires conscious or elaborative thinking, usually leads to longer-lasting attitude change. The peripheral route, which is a less conscious, more superficial view (e.g., on the surface, not the actual content) tends to lead to fleeting, and temporary attitude change. This theory on attitude change is called the Elaboration Likelihood Model (ELM).
Unfortunately, markets too often use logic or facts to persuade people and try to create some thought-provoking or clever message. In some cases, very simple emotional appeal will do (e.g., "that looks nice" turns into, "I feel good it"). Marketers, consider the level/depth of the message you're trying to convey while also considering what wavelength your audience is on.
Side note: If you're familiar with "System 1" and "System 2" processing, as taught by Daniel Kahneman in 'Thinking Fast and Slow,' this relates to this concept by explaining how persuasive messages can be processed depending on the individual's motivation and ability to elaborate on the information.