Two well-assorted travellers use
The highway, Eros and the Muse.
From the twins is nothing hidden,
To the pair is naught forbidden;
Hand in hand the comrades go
Every nook of nature through:
Each for other they were born,
Each can other best adorn;
They know one only mortal grief
Past all balsam or relief,
When, by false companions crossed,
The pilgrims have each other lost.

Ralph Waldo Emerson

http://www.poemhunter.com/poem/love-and-thought/