For you know the grace of our Lord Jesus Christ, that though he was rich, yet for your sake he became poor, so that you through his poverty might become rich. (2 Corinthians 8:9)
Iglesia ni Cristo ministers teach that Jesus was non-existent before he was conceived by Mary. He was just an idea in the mind of the Father. But this verse poses a major problem to that view. You see, Jesus was born in a poor family yet this verse says that isn't Jesus' original state. He was rich before he became poor. If he did not exist before he was born into Joseph and Mary's family, in what sense was he rich before he was poor?
This verse will only make sense in a framework which views Jesus as pre-existing before he became man (John 1:1; 8:58) And in that pre-incarnate state, he was equal in glory with the Father (Phil. 2:6; John 17:5). He was not just a pre-existing spectator to the Father's activities; he himself was very active in creation and in governing the affairs of nature and history (John 1:1-3; Hebrews 1:10; Col. 1:16-17). All privileges in the heavens and on the earth were his; in this sense he was rich.