An open door says, “Come in.”
A shut door says, “Who are you?”
Shadows and ghosts go through shut doors.
If   a door is shut and you want it shut,
     why open it?
If   a door is open and you want it open,
     why shut it?
Doors forget but only doors know what it is
     doors forget.

This poem originally appeared in "Poetry Not Written for Children that Children Might Nevertheless Enjoy," by Lemony Snicket.
“Doors,” from Wind Song, is copyright © 1957 by Carl Sandburg, and renewed 1985 by Margaret Sandburg, Janet Sandburg, and Helga Sandburg Crile, reprinted by permission of Houghton Mifflin Harcourt Publishing Company.
Source: Poetry (September 2013)
More Poems by Carl Sandburg