Wallace D. Wattles' century-old classic is still considered to be one of the most celebrated books considering wealth accumulation. The Science of Getting Rich set the platform for modern self-help books, identifying wealth not as something immaterial, but as something investible that took problem identification to overcome. Wattles identifies the problem of wealth attainment as a mental one, which can be resolved by "thinking in the Certain Way." Providing seventeen concrete steps, Wallace D. Wattles outlines how to master willpower, overcome mental stress, and eventually look at (and obtain) wealth in a healthy and abundant way.