"The Word of God Himself . . . assumed humanity that we might become God."
Please leave your guess in the comments section below. Please no google searches or cheating.
This statement comes from Athanasius' On the Incarnation (Sec. 54). Athanasius' statement has given rise to the notion of theosis.
The problem with theosis is one of definition. As several of the respondents pointed out, the concept grows out of 2 Peter 1:4 and takes a number of diverse forms--some orthodox, some not so. There is the Orthodox trajectory (divinization), as well as a Catholic/Augustinian trajectory (the final purification of the soul). The Reformed understand this notion in terms of union with Christ and final glorification. There is also a Wesleyan notion (Christian perfection), as well as LDS (man is eventually deified), and Word-Faith versions (man is a "little" god).