When you started to feel, it started to hurt sometimes. Feelings make us happier and sad. It introduces all the stages of life. It provides our life content & dissatisfaction.
Mind,eyes,ear& heart are the equipments of feeling. They teach us how to feel, & moreover our inner soul guide us how to feel.
When you started to love & care someone, you will started to feel fear for him. But when you started to hate someone you will desperately want to evade from that .
Just my thoughts 