Our haystack is large enough for all the sheep that come round it, and there is no need of our taking a single forkful from any other barrack.

By all means use all the books you can get at, but devour them, chew them fine and digest them, till they become a part of the blood and bone of your own nature.

There is no harm in delivering an oration or sermon belonging to some one else provided you so announce it.

Quotation marks are cheap, and let us not be afraid to use them.

Do you know why "quotation" marks are made up of four commas, two at the head of the paragraph adopted and two at the close of it?
Those four commas mean that you should stop four times before you steal anything.
If there were no question of morals involved, plagiarism is nevertheless most perilous.