Psalm 67

Psalm 67:4

Let the nations be glad and sing for joy,
For You will judge the peoples with uprightness
And guide the nations on the earth.
Selah.

Many nations are fundamentally unjust.  They allow, even encourage corruption.  Police are exploitative, judges prejudicial, politicians and rulers greedy.  Few in these nations have a chance for true justice, as they are not deemed worthy.

God will one day correct that.  He will hold the corrupt accountable, and make them pay for their crimes against Him.  He will rule directly, ensuring that justice is proper.  When that day comes, the peoples of the oppressed will praise Him, for He will have given them what man would not.

Psalm 66

Psalm 66:3

Say to God, "How awesome are Your works!
Because of the greatness of Your power
Your enemies will give feigned obedience to You.

God's works are amazing.  Everything we see is evidence of His power.  He created everything, and made everything mankind has developed possible.  Even those who doubt Him must obey.

However, that doesn't mean that they will obey because they want to.  They do it because they have no choice.  They see His power and His greatness, but don't really want to believe it.  So they obey, but it's fake.  They're looking for some way to discredit Him, or for Him to make a mistake.  They don't understand that that chance can never come.

Psalm 65

Psalm 65:10

You water its furrows abundantly,
You settle its ridges,
You soften it with showers,
You bless its growth.

The ground is naturally rather hard and barren, especially around Israel.  But God sends the rain, to soften the ground and smooth it.  This makes it possible for plants to grow.  And it's all because God causes it to be so.

In the end, God gives us all we need.  It may not be what we want, or what we think we need.  However, God knows better than we do what we actually need.  He will do what is required for us to be supplied.

Psalm 64

Psalm 64:9

Then all men will fear,
And they will declare the work of God,
And will consider what He has done.

God has just thwarted the plans of evil men, and brought them down.  This causes others to recognize what He has done.  They know that He is powerful, and that He cares about what happens on this earth.

Some will come to understand, and will tell others.  This spreads the knowledge that God is active, not something you pray and sacrifice to, and hope that it responds somehow.  He will do what He promises to do, and danger will come upon the one who ignores Him.