The title "The Chrysalids" signifies that it is a novel about change. The word "chrysalid" is related to the word "chrysalis", which means "the form which butterflies, moths, and most other insects assume when they change from the state of larva or caterpillar and before they arrive at their winged or perfect state". Or in simpler terms, it is the state where the caterpillar does most, if not all, of its change into a butterfly. Change can happen anywhere, whether it be in a physical form, such as the caterpillar turning into a butterfly, or evolution of entire species; a mental state, for instance a deeper comprehension of an emotion, or an education towards acceptance and understanding; or in a social environment, for example the abolishment of slavery and the non-discriminatory laws. Change is almost inevitable, fore it is the driving force of life. With out change life could not adapt to its surroundings and survive.
If change were to stop, then life would become meaningless. The Earth would be the same if there was life with no change, than if there was no life at all. Generally when people ponder about the notion change, they think about a process where a thing transforms into a better version of itself. While change is usually associated with evolution, it can sometimes be the complete opposite. Change can happen for the worse, though it is seldom seen. With life comes change, and though in The Chrysalids some change is not for the better, character, environment and the community all slowly develop into something else.
David changes a lot throughout the novel The Chrysalids. Many things in his life have shaped him, but the most significant is Sophie and the many promises he made as a young boy.