Envision is derived from Vision. Vision is a different concept from Sound. 
Middle is a synonym of Midst. Midst is a synonym of Thick. Thick is the opposite of Intelligent. Person wants (to) Intelligent. 
Envision --DerivedFrom--> Vision <--DistinctFrom--> Sound 
Middle <--Synonym--> Midst <--Synonym--> Thick <--Antonym--> Intelligent <--Desires-- Person 