The author described people not really living their life but sleepwalking through it on autopilot, pretending to be happy, not realising the extent of their misery, boredom or death, even. Then something unexpectedly meets them on their path; it could be a book, a song, a person or something else. Many people don’t recognise whatever has been sent and continue along their journey with their eyes half shut – but for others, it saves them.
