There are many ways to think, but some things about thought are inescapable: We are all human, and consequently, we must think by using the mental apparatus we are born with. This native apparatus is structured, and it tailors the ways we construct mental models to establish how we perceive things, as well as the relationships among the things beyond ourselves. This makes human thought a complex endeavor. Nevertheless, it can be described and analyzed so that its advantages and limitations can be appreciated. The goal of this book is to instruct readers how to become better and more systematic thinkers by elucidating (i) the mechanisms that humans possess for collecting and processing information, (ii) what the limitations of these mechanisms are and why they are important, and (iii) how attempts can be made to establish the truth of different types of information using the tools available to us. This is far from a trivial task, but it is crucial for establishing the veracity of what we know. Because of this, there is a need to adopt a structured approach for accepting the information we possess as true. Once you adopt such an approach, you will become more confident in your abilities to make proper decisions, including when and how to accomplish the things you want through your own actions. That will empower you to successfully pursue your proper destiny, which is by far the greatest purpose and joy in life.