New Defender's Study Bible Notes
9:8 all grace. God promises an abundance of “all grace” to those who learn the grace of giving and exercise it “cheerfully” (the Greek word in II Corinthians 9:7 is that from which we derive our word “hilarious”). Note the frequent use of superlatives in this verse—“all grace,” “always,” “all sufficiency,” “all things,” “every good work,” with “abound” occurring twice.
9:9 it is written. This testimony is found in Psalm 112:9, where it is describing “the man that feareth the LORD, that delighteth greatly in His commandments” (Psalm 112:1).
9:11 thanksgiving to God. We are to give thanks “in every thing” (I Thessalonians 5:18). The importance of being thankful is pointed out by the fact that such words as “praise” and “thanksgiving,” with their derivatives, occur some five hundred times in the Bible. A key evidence that a Christian is “filled with the Spirit” is that he or she is habitually “giving thanks always for all things unto God and the Father in the name of our Lord Jesus Christ” (Ephesians 5:18,20).