Experience Chan! It's not mysterious. As I see it, it boils down to cause and effect. Outside the mind there is no Dharma So how can anybody speak of a heaven beyond.
Experience Chan! It's not a field of learning. Learning adds things that can be researched and discussed. The feel of impressions can't be communicated. Enlightenment is the only medium of transmission.
Experience Chan! It's not a lot of questions. Too many questions is the Chan disease. The best wya is just to observe the noise of the world. The answer to your questions? Ask your own heart.