Emunah (faith) and Bitachon (trust) are so important for everyday life. You can't compare the quality of life of a person who has them with that of someone who doesn't.
I know myself. I once had a certain pressure added to my life, and I felt that the burden was too great to bear. I was walking around for a whole day with a heavy heart. On the outside, you couldn't tell, but I felt it on the inside. I didn't have an appetite. I was very nervous.
And then I started thinking: You have been talking about Emunah for a few years now. This is exactly the situation you need Emunah for. And I started going over the most basic principles, and it was so clear that I needed to talk it out. I gave a little class on these principles, and when I finished saying them, I felt like a mountain had been lifted off my shoulders. I felt carefree, like the pressure was nothing. Hashem is so big. Hashem put this in my lap. Hashem knows exactly what I could handle.
And I realized something very important. Emunah doesn't work if it's just in your brain, because I knew everything already. Emunah has to be in the heart, and that only happens with constant review of the same concepts over and over. The Chazon Ish said, “On a day that you don't work on Emunah, it automatically becomes weaker.” This is the greatness of a daily lesson: constantly working on it and being prepared for any challenge that life might bring your way.
This is the only way to bring it into your heart, as David the King said: “I believe because I talk.” And with Hashem's help, through constant talk and constant chizuk (encouragement), we will believe, and we will bring the concepts that we already know from our brains into our hearts.