Public domain. This passage is in the public domain. Mark Twain died in 1910, more than 70 years ago, and the work was first published in 1894. You can copy, print, read aloud or sell it without asking permission; a credit is kind but not required. The text is copied word for word from the Project Gutenberg edition linked here.
Those friends thou hast, and their adoption tried,Grapple them unto thy soul with hoops of steel;But do not dull thy palm with entertainmentOf each new-hatch’d, unfledg’d comrade.