The author ends in a very personal manner. At the same time, it is also strange for him to speak about his poverty at the end of the Psalm. He needs help—especially as it pertains to threats of being in a morass and later more concrete in the actions of his enemies. In the end, he speaks to God again in prayer, also confessing, You are my help and my deliverer, O my God. He stands on a rock. The strong connection which sounds throughout the Psalm, also sounds at the end: my God.
He adds to that with the do not delay,
which relates to the previous statement: make haste
(Psalm 40:13).
17 As for me, I am poor and needy, but the Lord takes thought for me. You are my help and my deliverer; do not delay, O my God!