I really think you are not aware of what the meaning of "context".It is more context than you provide!
This should help:
Context
[kon-tekst]
Phonetic (Standard)IPA
noun
- the parts of a written or spoken statement that precede or follow a specific word or passage, usually influencing its meaning or effect.
You have misinterpreted my remark because you took it out of context. - the set of circumstances or facts that surround a particular event, situation, etc.
The context of Eph. 2:8-10 is in the book of Ephesians.
Not your personal understanding of some verses in Romans.