Determining what is not a source of knowledge requires understanding common sources of knowledge. Typically accepted sources include:

• Experience: Learning through direct observation or participation.
• Reason: Using logic and deduction to arrive at conclusions.
• Authority: Accepting information from credible experts or sources.
• Intuition: Gaining knowledge through instinct or feeling.

Without specific options to choose from, it's difficult to definitively say what is not a source of knowledge. However, things that could be considered unreliable sources of knowledge include:

• Guesswork: Forming beliefs without evidence or reasoning.
• Superstition: Beliefs based on irrational connections or magic.
• Misinformation: False or inaccurate information.

To give a precise answer, please provide the list of options you are considering.