On this day when we celebrate the canonisations of these two popes, I would like to share some of what they wrote on priesthood.

First up, here is a link to Saint John XXIII's encyclical on St. John Vianney: 
http://www.vatican.va/holy_father/john_xxiii/encyclicals/documents/hf_j-xxiii_enc_19590801_sacerdotii_en.html

Here it is in PDF format: 
​http://www.catholicsociety.com/documents/john_xxiii/Sacerdotii_nostri_primordia.pdf


And, from Saint John Paul II comes the definitive document for our times on the formation of priests in the present day: 
http://www.vatican.va/holy_father/john_paul_ii/apost_exhortations/documents/hf_jp-ii_exh_25031992_pastores-dabo-vobis_en.html