What is the theme of "A Wrinkle in Time"?

The novel
is the epitome of a "good vs. evil" story. The theme of the
novel is that evil is an active, constant, present force that is consuming worlds and
dimensions. This is on prominent display when the three witches show the children the Earth from
a great distance, wrapped in a dark shroud with occasional bursts of light illuminating its
surface. This represented the lives and actions of good and pure people.

At
theof the novel, Charles Wallace does mentally battle with a physical manifestation of evil, the
disembodied brain IT, eventually winning out because of his love for Meg and their
father.

The primary theme in this novel is that there is a true and constant
battle between good and evil, and the only way to combat it is through good and charitable
loving actions for humanity.