Musar su Genesi 41:43

On 12,6 "Abraham traversed the land," Rashi comments נכנס לתוכה, "he entered into it." This is most appropriate, since Abraham began to understand the inner significance of ארץ ישראל. Later on we read in 12, 10 that Abraham descended (into Egypt) and subsequently (13, 1) that he ascended from Egypt. The Torah teaches that one does not recognise the advantage of light over darkness until one has experienced the latter. This was Abraham's experience in Egypt, [when he came from Charan his arrival in the land of Canaan is described only as "Abraham went…..they came to the land of Canaan (12,4/5), not a word about an עליה, an ascent. Ed.]. Egypt was considered a secondary מרכבה, as is alluded to in Genesis 41,43 when Joseph rides in מרכבת המשנה, "Pharaoh's number two state coach." Our sages understand these words as referring to the fact that next to the land of Israel, Egypt serves as an alternate מרכבה for G–d's Presence. The Zohar (Sullam edition Parshat Mikeitz page 23) describes it thus: G–d has a מרכבה עליונה and a מרכבה תחתונה. The latter one is called מרכבת המשנה, "the secondary carrier." Abraham utilized all the great wisdom he had acquired while he was in Egypt. Afterwards he ascended "southward" (13,1). Our sages have taught us the principle that "anyone who wishes to acquire wisdom should turn southward" (Baba Batra 28). Thus when Abraham returned to the "South" of the land of Canaan he began to learn the "real" wisdom, an appreciation of Jewish theology. It was then that he began to appreciate the real advantage of spiritual light over spiritual darkness.