Do not be surprised by the fact that even an individual person, through his or her deeds, can cause an elevation or degradation of the whole world. This is an unalterable law; the whole and its parts are as identical as two drops of water. Everything that occurs in the whole occurs in its parts as well. Furthermore, whatever happens in the parts happens in the whole, because the whole is only revealed through the manifestation of its individual parts, according to both their measure and quality.
This is how we can understand what is written in The Zohar that through the study of this book and the practice of the true wisdom, we can put an end to our state of exile and achieve a complete redemption.
— Rav Yehuda Ashlag (Baal HaSulam), “Introduction to The Book of Zohar,” Item 68
Studying The Zohar is above everything else, because the Torah has four levels of understanding of the Pardes (direct, hinting, allegorical, and secret). Those studying a simple commentary do not even imagine that there is a hidden meaning. But those studying The Zohar know that there is a secret in it, and this really helps with the correction of his soul.
— Rav Chaim Ben Yitzchok (Chaim Volozhin), Nefesh Chaim, Chapter 7
There is no other method to remove the external apparel from the Torah and reveal it, but through the works of Rashbi (author of The Zohar).
— Rav Moshe Cordovero (Ramak), Da et Elokey Avicha, Item 16