A classical work doesn't ever have to be understood entirely. But those who are educated and who are still educating themselves must desire to learn more and more from it. ↗
If the blame (if there is any) can be shifted from him to me, I shall help him and our cause by taking it. I desire, therefore, that all the responsibility that can be put upon me shall go there and shall remain there. ↗
All wealth consists of desirable things; that is, things which satisfy human wants directly or indirectly: but not all desirable things are reckoned as wealth. ↗
The desire to economize time and mental effort in arithmetical computations, and to eliminate human liability to error is probably as old as the science of arithmetic itself. ↗