y do humans have brains a heart is fine enough

You know i always wished that God shouldnt have gifted humans with brains a heart is good enough to handle all situations, I dont know but some how i always took decisions my heart told me to and i found mself really happy by doing so i beleive people love usiong their brains more than their hearts and that where the mistake happens i mean guys god has gifted all of us with such a beautiful thing a heart so y do we use our brains and not follow our heart and be happy yaar u know when we follow our heart the obstacles that we face are so much but the happiness that we get after following the heart is immense .....SO FOLLOW UR HEART AND LET THE BRAIN RELAX AFTER ALL IT IS JUST A BRAIN .....