In every instance and area in our lives we must completely rely on H'shem and only Him as the single source that can provide for us. Only after one has done this may he look to people as "task managers" working for GD taking care of his needs. 
pg 423

Nefesh Hachaim
The Karbanot uplifted the Nefesh of the animal atoning for our sins so too Tefilla uplifts our Nefesh and brings us closer to H'shem
Gate Two, Chapter 14 pg 97