Psalms 15-17

Psalms 15

Qualities that we should aim for:

• Blameless;
• Right;
• Speaks the truth;
• Does not slander with tongue;
• Does no evil to neighbour;
• No reproach;
• Honours and fears the LORD;
• Does not burden by charging interest; and
  
• No bribes.

So much qualities, only the Holy Spirit may help us achieve.

Psalms 16

• Comes to God for refuge.(16:1)
• Acknowledges he is not whole. (v2)
• God protects (v5)
• God guides (v7)
• God is of utmost priority (v8)
• All these brings assurance which in turns bring joy (v9)

Psalms 17

• David appears to be very confident that he is whole-heartedly with God. His prayer is from tongue free from deceit (v1). He claims that he has been tested by God but has passed and his mouth will not transgress (v3)
• Throughout, David has been able to distant himself away from the violence (v4) and keep to the paths of God (v5)
• He know God will answer (v6-7)
• What is "the apple of your eye"? (v8) Is it supposed to be good? Why are apples good?

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edited: (thanks to Sharon)
according to Wikipedia, the phrase "apple of my eye" is:

The saying originally meant the central aperture of the eye, presumably because apples were the most common sphere-shaped object around. The apple and apple tree were also a sacred symbols for the early British peoples. This is reflected in such stories as the Island of Avalon (which literally means Apple Island). Now, this phrase is usually figurative meaning something, or more usually someone, cherished above others.

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• I wonder under what situation he wrote this psalm? He seems to be attacked around (v9-13)
• God delivers (v14-15)