Chapter 16 marks a pivotal turning point in the relationship between Mary Lennox and Colin Craven. The narrative begins with Mary prioritizing her time in the secret garden with Dickon over her promise to visit Colin. While Martha warns that skipping the visit will put Colin in a "bad mood," Mary’s character development has not yet reached a point of deep empathy. She remains "not used to thinking of others' feelings," failing to grasp the profound isolation of a boy who is "ill and nervous" and struggles to control his temper. This negligence sets the stage for a dramatic explosion of suppressed emotions.
Upon her return, Mary finds that Colin has been acting "terrible all afternoon." Instead of yielding to his authority, Mary approaches him with a refreshing, if blunt, honesty. When Colin adopts his "Raja manner," threatening to banish Dickon, Mary refuses to be intimidated. The argument that ensues is a clash of two strong-willed, lonely children. Colin demands compliance, while Mary asserts her independence, declaring, "If you send Dickon away, I'll never visit you again."
Their verbal sparring escalates quickly. Colin accuses Mary of being "selfish" for spending time in the "dirt" with a "common country boy." Mary, fiercely protective of her friend, retorts that Dickon is "magical, like an angel" and levels the stinging critique that Colin is merely a "common Raja." This is the first time in Colin’s life that someone has dared to argue back, stripping away the deference he is accustomed to receiving from the household staff.
As the argument reaches a crescendo, Colin retreats into his habitual defense mechanism: self-pity. He whimpers, "I’m not selfish... I’m ill. I have a lump on my back, and I’m going to die soon." This moment exposes the core of Colin’s misery—his fear of his own physical condition. However, Mary, refusing to indulge his melodrama, responds "frostily" and "sourly," suggesting that he uses these claims to make people feel sorry for him. She boldly claims he is "proud of it," a realization that shocks Colin so deeply it causes him to forget his physical pain and sit "straight up" in rage, throwing a pillow at her.
Mary storms out, initially resolving to withhold all information about the secret garden as punishment. Her anger is palpable, yet as she walks back to her room, her perspective begins to shift. She begins to analyze Colin’s behavior, recognizing that his "tantrums" are rooted in fear—specifically, the fear that he will "become a hunchback and die."
By the end of the chapter, Mary’s empathy begins to override her resentment. She reflects on how being left alone likely exacerbated his anxieties. Despite the hostility of the encounter and the flying pillows, Mary makes a quiet decision: "I think I will go see him tomorrow." This resolution signifies Mary’s growing maturity. She realizes that Colin’s arrogance is a mask for his vulnerability, and she chooses to be the one person in his life who will challenge him rather than pity him, thereby offering him a path toward genuine connection and healing.