Evidence is derived from Evident. Evidence is related to Theory. Theory is related to Theological. 
Ease is a type of Quality. Quality is related to Level. Level is related to Gain. 
Evident <--DerivedFrom-- Evidence <--RelatedTo--> Theory <--RelatedTo--> Theological 
Ease --IsA--> Quality <--RelatedTo--> Level <--RelatedTo--> Gain 