Solidarity is “a firm and persevering determination to commit oneself to . . . the good of all and of each individual, because we are all really responsible for all.” It is found in “a commitment to the good of one's neighbor with the readiness, in the Gospel sense, to ‘lose oneself' for the sake of the other instead of exploiting him, and to ‘serve him' instead of oppressing him for one's own advantage.”xi
We are one human family, whatever our national, racial, ethnic, economic, and ideological differences. Our Catholic commitment to solidarity requires that we pursue justice, eliminate racism, end human trafficking, protect human rights, seek peace, and avoid the use of force except as a necessary last resort.
In a special way our solidarity must find expression in preferential option for the poor and vulnerable. A moral test for society is how we treat the weakest among us—the unborn, those dealing with disabilities or terminal illness, the poor, and the marginalized.
xi Compendium of the Social Doctrine of the Church, no. 193. (cf. Mt 10:40-42, 20:25; Mk 10:42-45; Lk 22:25-27)