An excerpt from: RABASH, Article No. 29, 1986 “Lishma and Lo Lishma”

"This is why Baal HaSulam said that each day when he engages in work in order to bestow he draws closer to the truth, meaning to see the amount of evil in him. In a dark house it is impossible to see that there are dirt and garbage there. But if you bring some light inside then you can see that there are dirt and garbage.

Similarly, when a person begins to engage in Torah and Mitzvot in bestowal, the Torah and Mitzvot illuminate for him more each time, to see the truth about the measure of evil in him. It therefore follows that each day he is moving forward until he reaches the complete evil within him. Then, when he begins to correct, a complete correction is made, so that afterwards he can put in his Kelim [vessels] the delight and pleasure that the Creator contemplated giving to the creatures, as it is written that the purpose of creation is to do good to His creations."

Part 1. RABASH "Concerning Love of Friends"

Part 2: Concepts in the structure of the worlds