Here is one of the first poems I ever memorized. It felt perfect to be memorizing a poem that spoke to the virtue of have a poem written in your head!
"Keep a poem in your pocket, and a picture in your head
and you'll never feel lonely, at night when you're in bed.
The little poem will sing to you, the little picture will bring to you,
a dozen dreams to dance to you, at night when you're in bed.
So-
Keep a picture in your pocket, and a poem in your head,
and you'll never feel lonely, at night when you're in bed.
-Beatice Schenk de Regniers