John Stuart Mill

One person with a belief is equal to a force of ninety-nine who
have only interests.

The only purpose for which power can be rightfully exercised
over any member of a civilized community, against his will, is
to prevent harm to others. His own good, either physical or
moral, is not a sufficient warrant.

The peculiar evil of silencing the expression of an opinion is,
that it is robbing the human race; posterity as well as the
existing generation; those who dissent from the opinion, still
more than those who hold it. If the opinion is right, they are
deprived of the opportunity of exchanging error for truth: if
wrong, they lose, what is almost as great a benefit, the
clearer perception and livelier impression of truth, produced
by its collision with error.

Solitude, in the sense of being often alone, is essential to any
depth of meditation or of character; and solitude in the presence
of natural beauty and grandeur, is the cradle of thought and
aspirations which are not only good for the individual, but which
society could ill do without.

There is no such thing as absolute certainty, but there is
assurance sufficient for the purpose of human life.

- All from John Stuart Mill