If you want to express the concept of "irfan" in Japanese, you would need to use a combination of words depending on the specific context. For example:
* 知識 (chishiki) - This is the most common word for "knowledge" in general.
* 悟り (satori) - This word implies a deeper understanding or enlightenment, often associated with Buddhism.
* 真理 (shinjitsu) - This word means "truth" and can also be used to express profound understanding.
* 霊的知識 (reiteki chishiki) - This phrase specifically refers to spiritual knowledge.
The most appropriate translation of "irfan" would depend on the context in which it is used.