It's about the dark side of human nature. It's a bit dense, and definitely not suited for unskilled readers, but it's pretty good. The movie "Apocalypse Now" is based on "Heart of Darkness."
The moral of the story is life is a gift, and maintaining a balance with everything in moderation will ensure a long one. The wings represent the father giving his son life; the ocean and the sun represent the extremes of denying and overindulging yourself; flying in between is the answer.
He found success later in life
Apartheid, no doubt, has determined life in South Africa during the period 1948-1994. Families had to work hard to overcome this situation. It needed strong determination of people affected by this fact who were permanently being challenged about their own feelings and family principles. In this case I consider Hally will accept Sam's peace offering since the feeling was strong enough to deal with the details of this situation.