Through a glass, darkly

1 Corinthians 13:12 contains the phrase

βλεπομεν γαρ αρτι δι εσοπτρου εν αινιγματι
which is rendered in the KJV as

"For now we see through a glass, darkly."
which refers to mirrors, not lenses. It has inspired the titles of many works.

Source: http://en.wikipedia.org/wiki/1_Corinthians_13