Another APEX Answer is:
Sometimes my heart was sinking so fast with anger, desolation, and weariness, I was afraid it would sink to the very bottom of the Pacific...(209)
Explanation:
Here Pi is fighting himself internally. He has depressing thoughts such as just giving up. He has a choice whether or not to act on those feelings which is the battle itself.
Philosphical the last word because it means its devoted to the study of knowledge
?????????? You call them Men