3:4a

In reading this, then: The word this refers to the writing Paul referred to in 3:3b.

then: The Berean Standard Bible has supplied the word then because it is good English style. It should only be translated if it would be natural to do so in your language.

Here are some other ways to translate this phrase:

When/if you read this…
-or-
As you read this ⌊earlier passage⌋…

3:4b

you will be able to understand my insight: In the Greek text, the phrase you will be able to understand my insight is in the present tense.

So here is another way to translate this phrase:

you can understand my insight

my insight: The phrase my insight refers to Paul’s ability to see and understand God’s formerly unknown plan concerning Christ.

Here are some other ways to translate this phrase:

you can perceive my insight (Revised Standard Version)
-or-
you can see that I truly understand (New Century Version)

mystery of Christ: The word mystery means “something that has not been explained.” In this context, mystery of Christ can mean “the secret (plan) put into effect by Christ.”

Here are some other ways to translate this phrase:

the secret purpose of Christ (Revised English Bible)
-or-
God’s secret plan carried out by Christ,
-or-
the hidden plan concerning Christ
-or-
the secret plan that tells about Christ

Also, see how you translated “the mystery of his will” in 1:9a and “the mystery” in 3:3a.

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