Psalm 37

Boice calls this psalm the fullest exposition of Jesus' third Beatitude, "Blessed are the meek..." Indeed the first portion of Psalm 37 speaks of Depending upon the Lord. We are to delight in Him, trust in Him, commit our way to Him, and be still before Him among other things. Finally in verse 11 we read that "the meek will inherit the land," which would mean the nation of Israel, although in Jesus' vernacular the meek inherit the earth, which is much less nationalistic and more universal.

Memorable verses abound here. "Delight yourself in the Lord and He will give you the desires of your heart," is verse 4. Be still before the Lord and wait patiently for Him..." is the beginning of the seventh verse. David is laying out how our life is to be and those instructions are memorable.
However, the focus turns to the wicked by verse 12. God will not let them prosper. Especially when compared to the way of the righteous, the wicked are doomed. The wicked borrow and do not repay, but the righteous give generously. A person is either a giver or a taker. David leaves no doubt which we are to be.

In verse 25, David describes himself as old, meaning this would have been written late in his life. He has never seen the children of the righteous begging for bread, but others certainly have. Still God provides, even if it is through the gifts received through begging.

The generalizations of the wicked being cut off and the righteous being blessed are problematic unless you consider the difference between long-range and short-range. The evil often succeed in the short term and the righteous will often lose the immediate battles, however the long term perspective is usually different -- especially if the long term goal is an eternal, rather than a temporal one. The instructions to "wait for the Lord" shows this perspective.