What are theme statements for To Kill a Mockingbird and how do they apply to the novel?Thanks.

There are a number of themes explored by Harper Lee in her
novel, To Kill a Mockingbird. Among
them:

LOSS OF INNOCENCE.  This theme
primarily involves the three children--Jem, Scout and Dill--who are exposed to a number of
life-altering experiences over the course of the
novel.

RACIAL PREJUDICE.  Although the
Tom Robinson trial is the prime example, there are other obvious examples of the intolerant
attitudes by white Maycomb citizens toward their African-American neighbors. The church group,
who pretends to offer aid to the Mruna tribe in Africa while scorning their own black neighbors,
is just one such case.

COURAGE VS.
COWARDICE.  The children show great courage in standing up for their
beliefs under duress, while Boo Radley shows his own bravery when he comes to the rescue of the
children. Bob Ewell is the most obvious example of the coward, a man who preys on children in
order to seek revenge against Atticus. The jurors, who refuse to accept the evidence before them
at the trial, are another example.

KNOWLEDGE
VS. IGNORANCE.  The author seems to group Scout's
various teachers among the ignorant members of the town. Miss Caroline tries to forbid Scout from
reading with her father, and Miss Gates spouts her defense of the Jews in Germany while spewing
her own bigotry against Maycomb's African-American community. Dolphus Raymond explains to Dill
that he is too young to understand all the hatred around him, but that he will understand it
better when he becomes older.