1:6 because our testimony about Christ was confirmed in you.

(NET Bible) just as the testimony about Christ has been confirmed among you.

In this way God’s message ⌊that we told you⌋ about Christ has been confirmed/verified among you.
-or-

⌊Those special abilities God has given to believers in your church⌋ prove/demonstrate that our message about Christ is true.
-or-
That is how God showed/proved to you that the message we (excl.) told you about Christ is true.

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