What is the fine-grained topic of the following text: It is written, The natural man receives not the things of the spirit, nor the Mystery of the kingdom of God, they are foolishness unto him, neither can he know them: therefore I admonish and exhort the Christian lover of Mysteries, if he will study these high writings, and read, search, and understand them, that he does not read them outwardly only, with sharp speculation and meditation; for in so doing, he shall remain in the outward imaginary ground only, and obtain no more than a counterfeit color of them. Only return the topic.
Understanding spiritual mysteries through inward reflection rather than outward speculation.