8:45

But: The Greek conjunction that the Berean Standard Bible translates as But here introduces a contrast. The contrast is that they believe the devil, who is a liar, but they do not believe Jesus, who speaks truth.

because I speak the truth, you do not believe Me!: The word because here introduces the reason why those people did not believe Jesus: he told the truth. They had chosen to follow the devil, the liar, and so they would rather believe a lie. Here is another way to translate this logical connection:

I tell the truth, and that is why you do not believe me. (Good News Translation)

In some languages it may be natural to reverse the clauses. For example:

you don’t believe me because I tell the truth (God’s Word)
-or-
the reason you (plur.) do not believe me is that I speak truth

I speak the truth: The Greek text emphasizes the word I to contrast Jesus with the father of lies. For example:

But as for me, I tell you the truth

you do not believe Me!: Here the word believe refers to believing what Jesus said. Here is another way to translate this clause:

you do not believe what I say

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