I think HLF at the end would have worked, but I believe the The Garden is actually meant to serve as the eulogy or "deathbed" epiphany of the protagonist. HLF doesn't quite fit that role as well as The Garden. Moreover, there are some similarities between the end of Ecclesiastes and The Garden. After having lived a long, unfulfilling life of hedonistic pursuits, the Teacher in Ecclesiastes finally concludes that the only true purpose of life to keep God's commandments, for that is how your life will be measured. In The Garden, the protagonist concludes after a life of adventure that the true purpose of life is to love and to give, for that is how your life will be measured.