“Children, if you dare to think
Of the greatness, rareness, muchness,
Fewness of this precious only
Endless world in which you say
You live, you think of things like this”

"Warning to Children," lines 1–11, from Poems 1929 (1929).
Poems
Context: Children, if you dare to think
Of the greatness, rareness, muchness,
Fewness of this precious only
Endless world in which you say
You live, you think of things like this:
Blocks of slate enclosing dappled
Red and green, enclosing tawny
Yellow nets, enclosing white
And black acres of dominoes,
Where a neat brown paper parcel
Tempts you to untie the string.