Having our prayers answered.

From a Shiur Based on the Writing of Rabbi Shimshon Pinchus
(teacher requests not to be quoted)

We can learn from the laws of Tzedakah, the way that Hashem answers our Tefillot. Just like we give Tzedakah first to the person who needs it the most, Hashem answers the prayers of the person who needs it the most. If we want our prayers to be answered, we have to let Hashem know that we really need what we are davening for. We do this by davening with all of our heart.