"Love is hard to believe, ask any lover. Life is hard to believe, ask any scientist. God is hard to believe, ask any believer." Yann Martel Life of Pi
I must admit I am not sure what his meaning is here. "Love is hard to believe". That doesn't make sense, it's just bad English. You can believe a statement, you can't believe a noun. I can't believe chocolate and I can't believe bananas so I can't believe love. I think he means "believe in the existence of love" or "believe that I am loved". And actually those aren't hard to believe in at all. Similarly, it's easy to believe that I am alive and that life exists. It's not much harder to believe in God, millions if not billions of people do after all. So what's the point here?
What is hard to believe is that a boy can come to be in a lifeboat with a tiger let alone survive 227 days on the open ocean.