Many chase spiritual knowledge through conventional means; but spiritual knowledge is acquired spiritually:
Proverbs 1:7 The fear of the LORD is the beginning of knowledge: but fools despise wisdom and instruction.
The Ancient Hebrew Lexicon of the Bible defines knowledge as:
A) Knowledge: To have an intimate relationship with another person, an idea or an experience.
The root word of knowledge yâda‛ is defined by Strong’s as:
Diligently pursuing an intimate relationship with the Lord is rewarded with wisdom, knowledge, and understanding:
Hebrews 11:6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.