While this is the a key to philosophy, it is also a key to one's personal psychology. People waste so much energy on having a dysfunction view and set of beliefs about themselves. If one focuses on getting realistic views and beliefs about oneself (and mankind), then one will save a huge amount of resistance and fighting barriers. Also, one will not put artificial limits on oneself by a false view of oneself.
This is vital, critical, essential to living a good life. It should command your time until it is fully and effectively designed and owned.
Some of the highly erroneous beliefs that people have are discussed in the following pieces:
Personal
Humans overall
Practices and viewpoints that affect one's view of oneself
