In H.G. Wells' "The War of the Worlds," the characters face dire circumstances that sharpen their mental acuity and expand their capabilities. The urgency of their survival forces them to adapt quickly to their environment, using their intellect to navigate the challenges posed by the alien threat. This necessity acts as a catalyst for growth, compelling them to harness their skills and think critically in extreme situations.

However, this pressure also takes a toll on their emotional state, hardening their hearts as they confront the harsh realities of their survival. The struggles depicted in the novel illustrate how the instinct for self-preservation can lead to a transformation in character, where individuals become more resilient but also more callous. Hence, necessity alters not only their abilities but also their humanity.