Psalms 90-92

Psalm 90 (Prayer of Moses, "the man of God")
God's Eternity and Human Frailty

See Charles Spurgeon's Treasury of David for commentary on this as a Prayer of Moses, cited in Psalms many years after his death. I particularly like what he has to say about the words from this psalm that are commonly used in funerals without recognition of their source- phrases like "you turn us back to dust" (v. 3); "a thousand years in your sight are like yesterday when it is past" (v. 4); and "the days of our life...are soon gone, and we fly away" (v. 10).

1-2 LORD, you have always been our dwelling place; you are God in eternity.
3-6 We are just dust in your hands, just as subject to time as you are not. The millenniums are like days to you.
7-12 We are subject to your anger; you see our secret sins; our 70 or 80 years come to an end with a sigh. Teach us to count our days; give us a wise heart.
13-17 Have compassion on us! Satisfy us with your steadfast love. Make us glad in our afflicted days and evil years. Prosper the work of our hands.

Psalm 91
Assurance of God's Protection

1-6 You who look to God for refuge and protection will receive it, fearing neither the terror of the night or the destruction of the day.
7-10 Though a thousand fall at your right and ten thousand on your left, you will be only an observer -- because you have made God your refuge and your dwelling place.
11-13 His angels will guard you, prevent you from cutting your foot on a stone, make you victorious over both lion and snake. This verse is one Satan uses in the temptation of Christ (Matthew 4:5-7). Apparently, he understood it to apply to the Messiah -- which means, of course, that he recognized Jesus as the Messiah.
14-16 Promise from God: I will deliver, protect, answer, be with, rescue, honor, satisfy, and save those who love me, who know my name.
As I read verses 7-13 in particular, I can hear the religious charismatics "claiming" these verses as promises that no physical ailment or harm will befall followers of God. But can we make this claim? Even Christians don't go through this life unscathed; they are as subject to the forces of nature as anyone is. Even if we apply this only to the Messiah, as Satan did, it fails. He, after all, died at the hands of evil men. Commentaries indicate that placing ourselves under God's care protects us from succumbing to evil, not the consequences of evil, which makes sense to me.

Psalm 92 (for the Sabbath Day)
Thanksgiving for Vindication

1-4 It is good to give thanks, to sing praises, to declare the steadfast love and faithfulness of God.
5-9 LORD, your works are good, and your thoughts are deep - unknown by the dullard, not understood by the stupid; they don't see they are doomed to destruction.
10-11 I have experienced your victory firsthand.
12-15 The righteous flourish, still producing fruit even in old age, showing that the LORD is upright, our rock, with no unrighteousness in Him.