The venerable Rabbi Avigdor Miller zt'l reaches out to the heart of every Jew. In this three part Jewish Ideology Series he covers the integral thoughts of Emunah and Bitachon that each and every one of us are to set our heights upon. His unique style brings the Father-to-son relationship between us and G-d, right to our fingertips. Third in the series.
I read this when I was an only-somewhat naive middle school kid, still living within the fold of Orthodox Judaism. I was on board as he tried to debunk evolution and the past existence of dinosaurs, but when he started trashing public libraries (because they have many "inappropriate" books), I put it down, disgusted. I don't recommend this to anyone as a book of guidance or advice - perhaps it might be interesting fodder for a detached study of the perspective of some (but not all!) Orthodox Jews.