As I read verses 13-15, I am reminded of the conflict in the early church (see Paul's letter to the Galatians for example) when those of them who had always been faithful, practicing Jews began to concede that non-Jews could also be good Christians. Back to us--can we read verse 13 as a reminder and an affirmation that God cares for more people than just us?
And what do we care about? Where do we place our faith? our trust? Verses 16-17 are reminders that we have often tried to substitute things that we have control over for the unmatchable power of God.
Yet, this psalm allows us to admit that God's people are not free from fear or pain--see verse 19 with its explicit reference to death and famine.
Thus, it is with an open realization that the world has dangers and that we can't control those dangers no matter how powerful we are, that we rely on the care of the Lord.
Lectio Divina: Psalm 33:22