Question: In which book is crossing the Machsom [1] (Barrier) described? Could it be that I have crossed it already and haven’t noticed?
Answer: You can learn about this by reading the material by Baal HaSulam on the subject of Tzimtzum Aleph.
Question: For a Kabbalist, who are the others? Are they his friends [2] in a group [3] or is every person considered to be one of the others?
Answer: First they are his friends on the path of spiritual development and then all those who are attached to it.
Question: What is “good” in spirituality, and in what way is it different from the materialistic “good?”
Answer: Good in spirituality represents the absolute good that leads a person to the purpose of his creation.
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Related Material:
Answers To Your Questions, Part 130 [4]
Answers To Your Questions, Part 129 [5]
Answers To Your Questions, Part 128 [6]