If one has been successful in accomplishing a good deed in the world or for another, he should look at it as a gift from H'shem and take no credit or pride. If he does seek honor, praise, and reward for being the Shaliach of good, it will spoil the purity within him, he will lose his reward and ruin the deed.
pg 435
Nefesh Hachaim
If one successfully attaches himself to the three levels of the tefillah and the corresponding levels of the Neshama, he has in essence connected himself to the Shoresh Neshama giving him the elevated feeling of being uplifted from the world and it's material restraints.
Gate Two, Chapter 18 pg 102
