9. The Ramban (end of this week's parashah) writes, "A person doesn't have a portion in the Torah of Moshe until he believes that everything that happens to us is all miracles, and there is no nature at all."
It is known that the Beis Aharon would tell his chasidim to read this Ramban every day because of its essential message.
Also, the Rosh (Orchos Chaim 1:26) writes, "Believe in Hashem's hashgachah pratis, and thereby, you will believe...that Hashem’s eyes see everything on earth, and His eyes see all the ways of man, and He examines the thoughts of the heart and kidneys. Because if a person doesn’t believe in yetzias Mitzrayim, מצרים מארץ הוצאתיך אשר (belief in yetzias Mitzrayim, belief in hashgachah pratis) he also doesn't believe in אלקיך 'ה אנכי... and this is the foundation of the Torah."
Degel Machaneh Efraim zt'l (beginning of Eikev) writes, "A great rule of avodas Hashem is to have emunah. My grandfather [the Baal Shem Tov zt'l] would always warn us about this. This is the foundation of the entire Torah and avodas Hashem. About this, Dovid HaMelech said (Tehillim 119:86) אמונה מצותיך כל, 'All Your mitzvos are emunah.'"
