# having been justified

"since God has declared us to be without sin" 

# we might become heirs having the hope of eternal life

The people to whom God has made promises are spoken of as if they were heirs, inheriting property and wealth from a family member. Alternate translation: "we might become like God's heirs, confidently waiting to inherit eternal life" or "we might have the confident expectation that God will cause us to live forever"