When it comes to our jobs how many of us can focus that the job itself is only the way H'shem sends the Parnasa not the source. As Rabbenu Bachya writes, " He should not grow to rely on that source, becoming enamored and obsessed with it, for then his reliance on GD will be weakened. One should thank the Creator who grave him substances after he had exerted himself." Again we see the message that Rabbenu Bachya is stressing here. One must first exert an effort for H'shem to be able to send him what he needs. On the other hand too much effort negating that H'shem is in charge can have the opposite effect that his needs will be withheld Chas Vishalom.
pg405/407