Sufficiency of Scripture

God’s written revelation is sufficient

Deuteronomy 4:1–2 ESV

“And now, O Israel, listen to the statutes and the rules that I am teaching you, and do them, that you may live, and go in and take possession of the land that the Lord, the God of your fathers, is giving you. You shall not add to the word that I command you, nor take from it, that you may keep the commandments of the Lord your God that I command you.

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The NT records the completion and fulfilment of the OT

Hebrews 1:1–2 ESV

Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.

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Warnings against turning from, or adding to, the apostolic gospel, as set forth in Scripture

Revelation 22:18–19 ESV

I warn everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues described in this book, and if anyone takes away from the words of the book of this prophecy, God will take away his share in the tree of life and in the holy city, which are described in this book.

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Descriptions of Scripture point to its sufficiency

Scripture is good

Romans 7:12 ESV

So the law is holy, and the commandment is holy and righteous and good.

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Scripture is perfect

Psalm 19:7 ESV

The law of the Lord is perfect, reviving the soul; the testimony of the Lord is sure, making wise the simple;

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Scripture is eternal

Psalm 119:89 ESV

Forever, O Lord, your word is firmly fixed in the heavens.

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