The Zohar, Chapter “Lech Lecha (Go Forth),” Item 104: When the Ruach comes out of this world and enters the cave of Adam HaRishon and the patriarchs, they give him there a letter as a sign, and he goes to the Garden of Eden. When he approaches, he meets the Cherubim there and that flaming sword which turns every way. If he is rewarded, they see the letter that is the sign, open the gate for him, and he enters. If not, they repel him outside.
When we read The Zohar, we should imagine a greater or a smaller desire to bestow or only the desire to receive, that is, we should envision changes in bestowal. That is the entire spiritual world. However, these variations contain all color shades and all gradations of qualities. Everything we read in The Zohar is about changes in the quality of bestowal which manifests as such in our perception.