Bitachon that everything that happens is good

 The Chazon Ish, i(Ha-emuna Ve-ha-bittachon, beginning of chapter 2). . . an old error has become rooted in the hearts of many concerning the concept of trust. Trust . . . has come to mean that a person is obligated to believe that whenever he is presented with two possible outcomes, one good and one not, then certainly it will turn out for the good. And if he has doubts and fears the worst, that constitutes a lack of trust. 

This view of trust is incorrect, for as long as the future outcome has not been clarified through prophecy, that outcome has not been decided, for who can truly know God’s judgments and providence? Rather, trust means realizing that there are no coincidences in the world, and that whatever happens under the sun is a function of God’s decree.