Solidarity is a fundamental word among progressives that differentiates them from the Right. Solidarity is also the fundamental link that unites human beings in every time and every place.

The instinct for solidarity is in the nature of the human race. Solidarity departs from the concept that all men are brothers, of a common origin. On the most basic level solidarity is the sense of participation in the difficulties and bad luck of others.

On a political and social level, solidarity expresses the concordance of many in aspirations to help each other. In a world intent on economic and scientific progress at the cost of a widening gap between rich and poor, the survival of the human instinct for solidarity has never been more essential. In this respect, solidarity is not an abstract ideal. That four-fifths of the world consists of have-nots is a fact.

Solidarity is a cornerstone of moral conduct.