Greatest is related to God. God is the One. Fear can be One. Fear can Confuse. 
Natural is a synonym of Necessary. Necessary is related to Duty. Duty is related to Type. Type is related to Course. 
Greatest <--RelatedTo--> God --DefinedAs--> One <--HasProperty-- Fear --CapableOf--> Confuse 
Natural <--Synonym--> Necessary <--RelatedTo--> Duty <--RelatedTo--> Type <--RelatedTo--> Course 