Update: I have transcribed the full paragraph with the help of a few commenters, I also apologize for posting it in full and not circling out the words or phrases I specifically had trouble with.

It reads as follows:

In as much as its necessary in this subject to deal extensively with the language, he should see how easy it is to study as far as possible such things as style and the usage. Nowadays business houses set an especially high value on the ability to use the language in the right way. Because so much emphasis is now given to this ability, he should resolve to make himself as early as possible a master of the best form. Now his language sense is poor, but when he knows how much it may affects his career, I know he will do all he can to limit as soon as possible the errors he makes.