I know that people spend a lot of time fixating on how to write a good opening line for their books ("It was a dark and stormy night", etc.), but Paradise Lost has I think the most beautiful closing passage of any book (spoilers for The Bible):

They looking back, all th' Eastern side beheld

Of Paradise, so late thir happie seat,

Wav'd over by that flaming Brand, the Gate

With dreadful Faces throng'd and fierie Armes:

Som natural tears they drop'd, but wip'd them soon;

The World was all before them, where to choose

Thir place of rest, and Providence thir guide:

They hand in hand with wandring steps and slow,

Through Eden took thir solitarie way.