Quote Originally Posted by Hulud
then its not knowledge

unless its knowledge of your mother
knowl⋅edge  /ˈnɒlɪdʒ/ Show Spelled Pronunciation [nol-ij] Show IPA
Use knowledge in a Sentence
–noun 1. acquaintance with facts, truths, or principles, as from study or investigation; general erudition: knowledge of many things.
2. familiarity or conversance, as with a particular subject or branch of learning: A knowledge of accounting was necessary for the job.
3. acquaintance or familiarity gained by sight, experience, or report: a knowledge of human nature.
4. the fact or state of knowing; the perception of fact or truth; clear and certain mental apprehension.
5. awareness, as of a fact or circumstance: He had knowledge of her good fortune.
6. something that is or may be known; information: He sought knowledge of her activities.
7. the body of truths or facts accumulated in the course of time.
8. the sum of what is known: Knowledge of the true situation is limited.
9. Archaic. sexual intercourse. Compare carnal knowledge.

perception can be wrong.