One who trusts in H'shem feels safe with others as he knows his success and failures are not in their hands and they alone can not cause him loss or harm. " He does not fear them nor does he expect from them". pg 453
Nefesh Hachaim "Only her lips moved" The Mitzvah of Tefilla is considered a physical mitzvah that must be performed with a physical service of enunciating every word slowly and clearly, even though it is called "the service of the heart." Just concentrating on the words is not considered having fulfilled the mitzvah and if one mistakenly performed the mitzvah of Tefillah in this way he must repeat the Tefillah.
Prologue to Gate Four Chapter 5 pg 127/128