What you think, you become
Echoes, per a summary
Wikiquote has Carnegie writing “Our thoughts make us what we are”, the same claim in his own words, and the excerpt credits no one.
- 3rd to 1st c. BCE
“All that we are is the result of what we have thought: it is founded on our thoughts, it is made up of our thoughts.”
Dhammapada. Earliest we can find, more than 1,900 years earlier.
- 1948
“If I knew what you think, I would know what you are. Our thoughts make us what we are.”
Secondhand, from Wikiquote. Dale Carnegie, How to Stop Worrying and Start Living (1948).
This book is still in copyright, so we read an account of it, not the book.
Sources
Wikiquote: en.wikiquote.org/