קבלה על ראש השנה 31:5

145. The GR"A explains that the reason for these two aspects of Rachel and Leah in Malchut is because there are two aspects of G-d's Kingdom. One aspect is our acceptance of the yoke of his kingdom willingly and faithfully without the force of miracles, as stated, "Say Malchuyot before me in order that you coronate me as your King." This is the ultimate goal of our service of G-d and is termed Rachel. The second aspect is the revelation of His Kingdom by force of miracles as in the exodus from Egypt and as will be in the time to come. This aspect displays G-d's splendor, yet he is called, "Humble" for, "Wherever His greatness is, so is His humility." This is termed Leah.
There are also two aspects of Zeir Anpin. Our adherence and acknowledgment of Gd's existence on the basis of faith, is termed Jacob -Yaakov, that is, that we recognize and believe that G-d is the source of all reward and punishment, though it is not readily apparent.
The second aspect represents the revelation of G-d as the source of everything, and is termed Israel - Yisrael. The essential quality in Zeir Anpin is that of -Yisrael - revelation, while the essential aspect in malchut is that of Rachel - acceptance.