It is a philosophical remark and it is true on that level for sure.
You cannot delegate the act of thinking because the process of delegation is itself a decision you have made in your own mind. The thoughts of your delegates are implicitly yours.
Just like if you include a library in your code, you are implicitly hiring the developers of that library onto your project. Your decision to use the library is hiring the people who wrote it, to implicitly write the code it replaces. (This is something I wish more people understood)
You cannot delegate the act of thinking because the process of delegation is itself a decision you have made in your own mind. The thoughts of your delegates are implicitly yours.
Just like if you include a library in your code, you are implicitly hiring the developers of that library onto your project. Your decision to use the library is hiring the people who wrote it, to implicitly write the code it replaces. (This is something I wish more people understood)