Psalm 41 is lament of a man who satisfies his responsibility to the poor under the covenant and now asks for the LORD’s help and vindication in the midst of severe suffering. 

1-3 – The opening section calls in faith on the LORD to honor the covenant with Israel by sustaining those who are kind to the poor.  As an example, see Proverbs 19:17 - Whoever is generous to the poor lends to the Lord, and he will repay him for his deed.  Note that the singer is praying according to God’s will.  See 1 John 5:13-15.

13 I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life. 14 And this is the confidence that we have toward him, that if we ask anything according to his will he hears us. 15 And if we know that he hears us in whatever we ask, we know that we have the requests that we have asked of him.

4-10 – The previous statement of faith now turns to the singer’s predicament, serious illness and betrayal by a close friend.  In John 13:18 Jesus applies this verse to Judas, the betrayer.    

11-12 – The singer returns to faith and acknowledges that the LORD will continue to honor him and to acknowledge his covenant help to the poor.  

13 – The end of Book One.  This a doxology concluding Book One.