One who trusts in H'shem concerns himself not with material worries, rather he is constantly reviewing and trying to improve his service of H'shem. He knows what truly counts in the end is the way in which he spends his time in this world gathering mitzvot and his Avodat H'shem pg 455 Nefesh Hachaim The Yetzer Hara may confuse you so much that you end up ignoring one's warnings that you are transgressing so that you don't seem as though you care and fear more what others think of you than what GD does. Prologue to Gate Four Chapter 8 pg 130