Must is related to Absolute. Absolute is the opposite of Dependent. Dependent is derived from Depend. Depend is related to Rely. 
Knowledge can be Power. Power is related to Master. 
Must <--RelatedTo--> Absolute <--Antonym--> Dependent --DerivedFrom--> Depend <--RelatedTo--> Rely 
Knowledge --HasProperty--> Power <--RelatedTo--> Master 