One who is known to be a person of Emuna is well-liked and trusted by all. They are confident that he will treat them kindly without anger, and their families and money are safe as all his actions are done with honesty and purity.
pg 453
Nefesh Hachaim
"The essential part of every mitzvah is the performance, purity of intention is of secondary concern" One who performs a mitzvah will get the reward and credit, one who misses doing the mitzvah, even if he was preparing himself will get punished for having missed the mitzvah.
Prologue to Gate Four chapter 5 pg 127