Theeopnusdos: A Word Study

In Hebrews 1-3, for example, says Christ is the exact representation of God's nature or substance in Greek apostases. But by the fourth century, the word apostases was no longer the common Greek word for nature or substance. So we can't read the modern definition of those terms back into their uses in scripture and ancient documents. We also need to study how the word Theeopnusdos was used in the ancient church and in the ancient context in which these documents were writtento find out what it meant in that context.