The stone walls and the iron bars

This one has Capt. Lovelace's most famous lines---Stone walls doe not a prison make,/Nor iron bars a cage;---but the poem has so much more than that: the easy mastery of meter and rhyme, the simple and natural use of refrain, the priamelic structure ...  It's a masterpiece!

Yet it's not my favorite Lovelace poem, I'll post that one later  :)
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To Althea, from Prison

By Richard Lovelace

I.

When love with unconfined wings

        Hovers within my gates;

And my divine Althea brings

        To whisper at the grates;

When I lye tangled in her haire,

        And fetterd to her eye,

The birds, that wanton in the aire,

        Know no such liberty.

II.

When flowing cups run swiftly round

        With no allaying Thames,

Our carelesse heads with roses bound,

        Our hearts with loyal flames;

When thirsty griefe in wine we steepe,

        When healths and draughts go free,

Fishes, that tipple in the deepe,

        Know no such libertie.

III.

When, like committed linnets, I

        With shriller throat shall sing

The sweetnes, mercy, majesty,

        And glories of my King.

When I shall voyce aloud, how good

        He is, how great should be,

Inlarged winds, that curle the flood,

        Know no such liberty.

IV.

Stone walls doe not a prison make,

        Nor iron bars a cage;

Mindes innocent and quiet take

        That for an hermitage;

If I have freedome in my love,

        And in my soule am free,

Angels alone that sore above

        Enjoy such liberty.