One who does not trust in H'shem will use any means honest or dishonest to acquire wealth without giving any thought to his later end.
451/453
Nefesh Hachaim
Another tactic of the Yetzer Hara in his efforts of distraction is to persuade one to be involved in "purification" the entire day missing the opportunities to fulfill his obligations and mitzvot properly. One must be aware that if he is inclined to focus more on purifying his thoughts than on what is commanded of him, he has been tricked by the Yetzer Hara.
Prologue to Gate Four Chapter 4 pg 126/127