What are two common literary themes that the story Life of Pi by Yann Martel most clearly shows?

There are many messages in Yann Martel's Life of Pi, not just one. However, one of Martel's main messages in to have not be excessively reasonable, to the extent where you reject all the wonders of the universe. He encourages the reader to suspend disbelief and scepticism in relation to the story implausible with animals, in order to consider its possibility. In this same way, he encourages the reader to take a leap of faith in order to have faith in something; in particular to have faith in God.