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acquired animal appear arrangements attention body cause character Christian circumstances classes communicated conduct connected consequently considerable considered contained course desire directed displayed distance divine earth effects established eternal evidence exercise exhibited existence experiments facts faculties feel frequently future give globe hand happiness heaven human hundred idea ignorance illustrated importance improvement instruction intellectual intelligence interesting kind knowledge laws lead less light mankind manner material means ments miles mind moral motion nature never objects observations operations pass perceive perfection period persons philosophers portion powers practice present principles produce promote rational reason regions relation religion require respecting scenes schools similar society spirit suppose teacher thing thousand tion truth universe variety various whole wisdom young