At best, knowledge is like a map and experience is like the terrain that the map refers to. Knowing should never be confused with experiencing.
Yet, in practice, knowing is often confused with experiencing. That is, people often think they are making spiritual progress when what they are really doing is merely gaining knowledge. That is the same mistake as thinking one is hiking along a trail in the mountains when all one is really doing is reading a map of the hiking trail.
Entire theologies have been based on this error.