Trust in the Almighty calms a person from fears and worries. A person who lives with trust in God is aware there are no accidents. He knows whatever happens to him is purposeful.
Trust in God does not mean we must assume that “everything will be all right.” We have no way of knowing in advance exactly how events will turn out. Rather, trust in God means that whatever occurs is for our ultimate good, and we have the ability to withstand any tests.
Speaking pious sentiments of trust in God is not sufficient. A person has to actually feel this trust for it to actually effect on his emotions.
(Alei Shur, p.258; Rabbi Pliskin’s Gateway to Happiness, p.166)