Pope John XXIII begins this encycli­cal by review­ing the major points of The Con­di­tion of Labor and The Recon- struc­tion of the Social Order. He notes that new polit­i­cal, social, and eco­nom­ic devel­op­ments have neces­si­tat­ed Chris­tian­i­ty and Social Progress. He con­firms pre­vi­ous papal teach­ing on the val­ue of pri­vate ini­tia­tive, just remu­ner­a­tion for work, and the social func­tion of pri­vate prop­er­ty. John XXIII then treats the ques­tions of agricul- ture and aid to devel­op­ing coun­tries. He urges a recon- struc­tion of social rela­tion­ships accord­ing to the prin­ci­ples of Catholic social teach­ing and states the respon­si­bil­i­ty of indi­vid­ual Chris­tians to work for a more just world.