Recap: book

Recently, started to refresh the books which I read before.

First REcap!

"An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return."

Who wrote the above?
In addition, it consists equally of three elements:

1. You must thoroughly analyze a company, and the soundness of its underlying businesses, before you buy its stock.
2. You must deliberately protect yourself against serious losses.
3. You must aspire to "adequate", not extraordinary, performance.

So who wrote the above? guess?