Show me the meaning...

" The heart does things for reasons that reason cannot understand"

This comes to me as a consolation, an excuse for certain behaviour that we display. Who claims to always have rational thoughts and actions? Never happens. After all, we're only human. Some happenings are extremely joyful. Others are extremely painful.
What defines the pain that someone feels? Everyone feels differently. Everyone is offended differently.
People shout, people sulk, people hate. Sometimes there is nothing that can be done to console them. But sometimes there is also nothing that can explain this behaviour, and thats when I think of the above line -- the heart does things for reasons that reason cannot understand.
Why do I shout? Why do I sulk? Knowing always, that there is no rational explanation? What do I say when people ask? I tell them... that the heart does things for reasons that reason cannot understand.