![To see a world in a grain of sand - text in concrete.](https://www.colorado.edu/csl/sites/default/files/styles/medium/public/article-image/geometrypoint018.jpg?itok=UXLuahLU)
![And heaven in a wildflower](https://www.colorado.edu/csl/sites/default/files/styles/medium/public/article-image/geometrypoint025.jpg?itok=EsLFKevE)
![Hold infinity in the palm of your hand](https://www.colorado.edu/csl/sites/default/files/styles/medium/public/article-image/geometrypoint029.jpg?itok=E8hEj0f5)
![And eternity in an hour.](https://www.colorado.edu/csl/sites/default/files/styles/medium/public/article-image/geometrypoint013.jpg?itok=7cgXkh2E)
From William Blake's "Auguries of Innocence,"
Thinking about infinity is the heart of calculus.
"To see a world in a grain of sand,
And heaven in a wildflower,
Hold infinity in the palm of your hand,
And eternity in an hour."
The full poem:
Auguries of Innocence
Source: Poets of the English Language (Viking Press, 1950)