On the one hand, a <u>gerund</u> is a verb that acts as a noun, know for the -ing form. On the other hand, an <u>infinitive</u> is the basic form of a verb, that usually follows "to" or another verb form. The revised sentence, including both of these, is:
"To give is one of the best things people can do. Volunteering their time shows what caring people they are."
Academically, cutting it very broad technically, these two geniuses might
be classed as `Romantics` but they are not typical of The Romantics.
You might find, yes, the first answers` suggestions - Keats, Wordsworth, some of Elisabeth Barrett Browning, Christina Rossetti having more the flavour and adornment and/ in rhyme more typical than either Dickinson or Whitman whose deep works reflected more the cultural, than The Romantic zeitgeist. Dickinson, melancholically, Whitman more exuberantly... Though if tyou like them, or one, you will enjoy the task more :) and be more exacting I imagine.