4:13a And in keeping with what is written: “I believed, therefore I have spoken,”

It is written ⌊in the Scripture⌋, “I believed, so I spoke.”
-or-
Someone wrote ⌊in God’s holy book⌋, “I spoke because I believed.”

4:13b we who have the same spirit of faith also believe and therefore speak,

We (excl.) also believe and therefore speak with that same spirit of believing,
-or-
In the same way, we also believe and therefore speak,

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