"Kindness is the act or the state of being kind, being marked by good and charitable behavior, pleasant disposition, and concern for others. It is known as a virtue, and recognized as a value in many cultures and religions (see ethics in religion). Research has shown that acts of kindness does not only benefit receivers of the kind act, but also the giver, as a result of the release of neurotransmitters responsible for feelings of contentment and relaxation when such acts are committed. "
According to book two of Aristotle's "Rhetoric" it is one of the emotions, which is defined as being "helpfulness towards some one in need, not in return for anything, nor for the advantage of the helper himself, but for that of the person helped".
Analysts warn that 'real kindness changes people in the doing of it, often in unpredictable ways. Real kindness is an exchange with essentially unpredictable consequences'.
They also argue that, in a relationship, 'real kindness, real fellow-feeling, entails hating and being hated - that is, really feeling available frustrations – and through this coming to a more real relationship'.