From Edna St. Vincent Milay's poem Renascense
The world stands out on either side
No wider than the heart is wide;
Above the world is stretched the sky,— 205
No higher than the soul is high.
The heart can push the sea and land
Farther away on either hand;
The soul can split the sky in two,
And let the face of God shine through. 210
But East and West will pinch the heart
That can not keep them pushed apart;
And he whose soul is flat—the sky
Will cave in on him by and by.