One should not trust in his actions and the reward he hopes will come, he should " Show gratitude for the Creators favors continually bestowed upon him" without being preoccupied with future reward.
pg 445
Nefesh Hachaim
The practice of thinking and talking about how H'shem fills the world what was before and how He fills it yet today is greatly discouraged. Our minds can not comprehend and we should discourage such actions as it says " Go back to praying to H'shem and be in awe of HIm. The greatest sages cannot understand these matters".
Gate Three, Chapter 6 pg 115