If his intention in helping someone is for payment, honor and praise instead of serving GD he will "labor in vain" and will lose his reward in the world to come.
423

Nefesh Hachaim
When one focuses his concentration in Tefilah on the written word while disregarding his own body and worries, thinking only of increasing the flow and connection of the Shechina in this world he will eventually achieve "pure and simple kavanah"
Gate Two, Chapter 13 pg 96
423
Nefesh Hachaim
When one focuses his concentration in Tefilah on the written word while disregarding his own body and worries, thinking only of increasing the flow and connection of the Shechina in this world he will eventually achieve "pure and simple kavanah"
Gate Two, Chapter 13 pg 96