John 17:17“Sanctify them by Your truth. Your word is truth.”
Titus- God who cannot lie
It tells us the truth about salvation
The sufficiency of Scripture
2 Timothy 3:16–17“All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work.”
It tells us enough for salvation
The authority of Scripture
As it is the word of God it carries the authority of God.