Chapter 64

David.  We are not told about his circumstances when he wrote it.

1st, David asks for protection from those who would harm him.

2025 - This verse, and this recurring theme of David's Psalms:

1 To the choirmaster. A Psalm of David. Hear my voice, O God, in my complaint; preserve my life from dread of the enemy. 2 Hide me from the secret plots of the wicked, from the throng of evildoers, [Psa 64:1-2 ESV].

David does not ask for super human strength, for skill with bow or sword, not even for a million man army to back him up.  He asks to be hidden from the evildoers.  He leaves the fight to God, because only God can win against such odds, such secretive evil-doers, from liars and sons of liars.  From those so practiced at deceit that David was just no match for their schemes.  But God was, is, and shall be!

2025 - We also have this idea again:

4 shooting from ambush at the blameless, shooting at him suddenly and without fear. [Psa 64:4 ESV].

The evil do not fight eye to eye, face to face.  If they do, it will be obvious to all that they are the real enemy.  They excel at deceit.  Vss 4-6 describe their methods.

2025 - In vvs 7-9 we see God's actions against them.  He wounds them so they stumble.  When they stumble, they are revealed for all to see.  They are revealed for what they are. 

2nd, When God brings the evil down, others see it and ponder what God has done.

3rd, Let the righteous take refuge in God.