follow your heart?

Some say; "follow your heart" sum say; "follow your intellect". I understand how the intellect works, it functions off of learned behavior and current information.. but I couldn't figure out the heart (how does the heart function?) until I read this :

In Genesis 18:5, the heart is refreshed. A Midrash catalogued the wide range of additional capabilities of the heart reported in the Torah.[105] The heart speaks,[106]sees,[107] hears,[108] walks,[109] falls,[110] stands,[111] rejoices,[112] cries,[113] is comforted,[114] is troubled,[115] becomes hardened,[116] grows faint,[117] grieves,[118]fears,[119] can be broken,[120] becomes proud,[121] rebels,[122] invents,[123] cavils,[124]overflows,[125] devises,[126] desires,[127] goes astray,[128] lusts,[129] can be stolen,[130] is humbled,[131] is enticed,[132] errs,[133] trembles,[134] is awakened,[135] loves,[136] hates,[137]envies,[138] is searched,[139] is rent,[140] meditates,[141] is like a fire,[142] is like a stone,[143]turns in repentance,[144] becomes hot,[145] dies,[146] melts,[147] takes in words,[148] is susceptible to fear,[149] gives thanks,[150] covets,[151] becomes hard,[152] makes merry,[153]acts deceitfully,[154] speaks from out of itself,[155] loves bribes,[156] writes words,[157]plans,[158] receives commandments,[159] acts with pride,[160] makes arrangements,[161] and aggrandizes itself.[162]