Moral development continues throughout the life span, even spawning dialogue of philosophical implications of such research.

The aim of education should be development.

Right action tends to be defined in terms of general individual rights and standards which have been critically examined and agreed upon by the whole society.

The Heinz dilemma exposes not the choice a person makes, but the structure of reasoning that justifies the choice.

You are not a fish — how do you know the fish's pleasure?

-- Zhuang Zhou

The peculiar evil of silencing the expression of an opinion is that it is robbing the human race ... those who dissent from the opinion, still more than those who hold it.

-- John Stuart Mill

The public sphere is a social phenomenon just as elementary as action, the actor, the group, or the collective; but it eludes the conventional sociological concepts.

-- Jürgen Habermas

Truth springs from argument amongst friends.

-- David Hume

Unlimited tolerance must lead to the disappearance of tolerance.

-- Karl Popper

Democracy has to be born anew every generation, and education is its midwife.

-- John Dewey