David writes a thankful response for the realization of his Psalm for the people to intercede and petition for him in Psalm 21. 

Thankfulness, no matter what the answer to our prayers may be can be hard, but in this Psalm we see how we can find joy and thankfulness for the answer of "yes" and the answer of "no".

As we look to the future in the second half of the Psalm, we find even more reason to rejoice and the challenge for us in the first half.