...and suddenly it occurred to him that the birds, whose twitters and repeated songs sounded so pretty and affirming of nature and the coming day, might actually, in a code known only to other birds, be the birds each saying 'Get away' or 'This branch is mine!' or 'This tree is mine! I'll kill you! Kill, kill!' Or any other manner of dark, brutal, or self-protective stuff—they might be listening to war cries. The thought came from nowhere and made his spirits dip for some reason.

I perhaps could have been somewhat better. One of the interesting things about playing competitive sports as a child is that you confront your own limitations rather starkly at a certain point.

In reality, genuine epiphanies are extremely rare. In contemporary adult life maturation & acquiescence to reality are gradual processes. Modern usage usually deploys epiphany as a metaphor. It is usually only in dramatic representations, religious iconography, and the 'magical thinking' of children that insight is compressed to a sudden blinding flash.

I am not what you see and hear.

That as people age, accumulate more and more private experiences, their sense of history tightens, narrows, becomes more personal? So that to the extent that they remember events of social importance, they remember only for example 'where they were' when such-and-such occurred. Et cetera et cetera. Objective events and data become naturally more and more subjectively colored.

Stated as an English sentence, of course, this is just a banal platitude - but the fact is that, in the day-to-day trenches of adult existence, banal platitudes can have life-or-death importance. That may sound like hyperbole, or abstract nonsense.

One paradox of professional writing is that books written solely for money and/or acclaim will almost never be good enough to garner either.