Synthesized answer
The provided passages do not contain enough information to answer the question about explaining the key concepts in my own words. The passage is a title and category for a book, and does not include any content from the book itself. Therefore, I cannot explain any key concepts as requested.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: How I See Philosophy by Friedrich Waismann Categories: Philosophy Pages: 269