▁or ▁herself ▁experienced ▁love ▁or ▁being ▁loved . ▁In ▁fact , ▁to ▁such ▁a ▁person ▁love ▁would ▁appear ▁to ▁be ▁quite ▁strange ▁if ▁not ▁out right ▁ir r ational ▁behavior . ▁Among ▁the ▁prev ail ing ▁types ▁of ▁theories ▁that ▁attempt ▁to ▁account ▁for ▁the ▁existence ▁of ▁love ▁there ▁are : ▁psych ological ▁theories , ▁the ▁vast ▁majority ▁of ▁which ▁consider ▁love ▁to ▁be ▁very ▁health y ▁behavior ; ▁there ▁are ▁evolution ary ▁theories ▁that ▁hold ▁that ▁love ▁is ▁part ▁of ▁the ▁process ▁of ▁natural ▁selection ; ▁there ▁are ▁spiritual ▁theories ▁that ▁may , ▁for ▁instance ▁consider ▁love ▁to ▁be ▁a ▁gift ▁from ▁God ; ▁there ▁are ▁also ▁theories ▁that ▁consider ▁love ▁to ▁be ▁an ▁un exp lain able ▁mystery , ▁very ▁much ▁like ▁a ▁myst ical ▁experience . ▁ ▁Western ▁trad itions ▁ ▁Class ical ▁roots ▁Setting ▁aside ▁Emp ed oc les ' s ▁view ▁of ▁E ros ▁as ▁the ▁force ▁binding ▁the ▁world ▁together , ▁the ▁roots ▁of ▁the ▁classical ▁philosophy ▁of ▁love ▁go ▁back ▁to ▁Pl ato ' s ▁Sym pos ium . ▁Pl ato ' s ▁Sym pos ium ▁dig s ▁deeper ▁into ▁the ▁idea ▁of ▁love ▁and ▁bringing ▁different ▁interpret ations ▁and ▁points ▁of ▁view ▁in ▁order ▁to ▁define ▁love . ▁From ▁its ▁rich es , ▁we ▁may ▁perhaps ▁single ▁out ▁three ▁main ▁threads ▁that ▁would ▁continue ▁to ▁rever ber ate ▁through ▁the ▁centuries ▁that ▁followed . ▁The ▁idea ▁of ▁two ▁lov es , ▁one ▁heaven ly , ▁one ▁earth ly . ▁As ▁Uncle ▁T oby ▁was ▁informed