Although the phrase "all things both great and small" is familiar to many people, few are aware that this expression originated in the 18th century and is a line from the poem, The Rime of the Ancient Mariner. And most are not familiar with the rest of the verse from which it is taken.

He prayeth best, who loveth best 
Both man and bird and beast.

He prayeth best, who loveth best 
All things both great and small; 
For the dear God who loveth us, 
He made and loveth all.