Ooh yes i have lots of favorite poetry lines! The one that comes to mind right now is from "The Song of Sherwood," by Alfred Noyes, which is about Robin Hood; it says Robin Hood has returned and is "Calling as he used to call, faint and far away." Somehow those words - "calling as he used to call" thrilled me the first time I read it the poem.

Literally all of Nothing Gold Can Stay by Robert Frost. I wrote it on my wrist. It's very pretty

Okay, so the poems in TOA are great. For example: You've got to be kid--/well, crud, what happened there?/I ran out of syl--/  also: practice makes perfect / ha, ha, ha, I don't think so / Ignore my sobbing

(Inkling says "tfyep" probably meaning "true feelings, yep" likely referring to the last poem)

I like a lot of oldish stuff, mainly because those are the kind of poetry books in my house. I like Robert Frost's poems -- Nothing Gold Can Stay (as Rainbow already mentioned), Fire and Ice, The Road Not Taken, The Objection to Being Stepped On, Dtars, and many others. I also like Edna St Vincent Millay's poetry, especially Spring, City Trees, Travel, and Recuerdo, the latter of which I've had stuck in my head all week. I also like the imagery of Emily Dickinson's The Forgotten Grave, especially the last lines -- "Winds of summer fields / Recollect the way, — / Instinct picking up the key / Dropped by memory." 

I love these lines:

"The saddest noise, the sweetest noise,

the maddest noise that grows

The birds, they make it in the spring

At night's delicious close."

It's from a poem by Christina Rossetti. @pangolin, I tend to like older poetry too! Much better than modern poetry, actually.

I love Robert Frost. One of my favorite poems of his are "Stopping by the Woods on a Snowy Evening." I especially love the last stanza:

The woods are lovely, dark and deep,

But I have promises to keep,

And miles to go before I sleep,

And miles to go before I sleep.

Raymond Carver's "What the Doctor Said" is also a really good but very said poem. It delivers a real "punch in the gut" ending:

I jumped up and shook hands with this man who'd just given me 

Something no one else on earth had ever given me

I may have even thanked him habit being so strong 

This one my awesome 3rd grade teacher likes:

so much depends / upon/ a red wheel/ barrow / glazed with rain / water / beside the white / chickens 

by William Carlos Williams

Also from 3rd grade I'm Nobody! Who Are You? by Emily Dickinson. It's really good

Okay so this isn't a poetry line but it has to do with poetry so... Anyways today my friend gave me for no particular reason I think a poetry journal thingy. Like, the kind with like prompts. It's cool

Dreaming dreams no mortal ever dared to dream before -- Poe

O cold, cold is my heart! It will not, cannot rise -- Emily Brontë

No sword/Of wrath her right arm whirl'd/But one poor poet's scroll, and with his word/She shook the world -- Tennyson

The average hippopotamus/Is large from top to bottomas

-The Average Hippopotamus by Jack Prelutsky

My favorite poetry line is the first line of "Jabberwocky" (Lewis Carroll). It goes:

"'Twas brillig, and the slithy toves

Did gyre and gimble in the wabe;

All mimsy were the borogoves,

And the mome raths outgrabe."