'To open,' as in Revelation 9, signifies communication and conjunction.

(Odkazy: Apocalypse Explained 537)

344. What is the use of faith, that is, what is the use of knowledge, awareness, and doctrine related to faith, other than of becoming such as it teaches? The first thing faith teaches is charity, Mark 12:28-35; Matthew 22:35-40, charity being the end of everything faith has in view. If a person does not become as it teaches, what is knowledge or doctrine but something which is in fact nothing?