One way that the idea of "life has to go on" is brought out in Bond's story can be in Tembu himself. Tembu does not shut down as a result of his father's death. He does not wall himself in a room and continually mourn. Rather, he demonstrates the truth in the idea that "life has to go on" when his father dies. He understands that he must take up his father's post at the tunnel. Tembu recognizes that "life has to go on" in the way he takes on added responsibility for the family. While Baldeo's death is terrible, Tembu understands that he must mature beyond his years. He might have been scared at one point, but in recognizing what he has to do, Tembu shows growth and the sustaining life force that subsumes all.
In having to assume greater responsibility, Tembu demonstrates how life has to go on. At the end of the story, he is no longer afraid as he used to be. He will be the next night watchman. Life has continued on, moving him into the position that his father used to hold. Tembu's growth demonstrates how life has to go on. It must continue despite pain and suffering, something that is evident in Tembu's new found responsibility.