Sacerdotalis Caelibatus §22

²² Jesus, who selected the first ministers of salvation, wished them to be introduced to the understanding of the "mysteries of the kingdom of heaven," (29) but He also wished them to be coworkers with God under a very special title, and His ambassadors. (30) He called them friends and brethren, (31) for whom He consecrated Himself so that they might be consecrated in truth; (32) He promised a more than abundant recompense to anyone who should leave home, family, wife and children for the sake of the kingdom of God. (33) More than this, in words filled with mystery and hope, He also commended an even more perfect consecration (34) to the kingdom of heaven by means of celibacy, as a special gift. (35) The motive of this response to the divine call is the kingdom of heaven; (36) similarly, this very kingdom, (37) the Gospel (38) and the name of Christ (39) motivate those called by Jesus to undertake the work of the apostolate, freely accepting its burdens, that they may participate the more closely in His lot.