Depressive Realism is a hypothesis developed by Lauren Alloy and Lyn Yvonne Abramson in 1979. Their theory suggests that depressed people have a more realistic view of the world compared to non-depressed individuals. The theory from these two psychologists sheds light on negative and positive cognitive biases and the effect on individual realities. The results remain controversial having evidence on both sides of the argument.
William Walker Atkinson wrote Thought Vibration or the Law of Attraction in the Thought World in 1906. His publication supported his idea for a law of attraction. What we think manifests in our reality. Thoughts attract like things according to Atkinson. Evidence is lacking to support his claims but it hasn't stopped people from believing in the power of his law.