Love and charity, Pope Francis writes in Evangelii Gaudium, is threaded through the Word of God:
179. This inseparable bond between our acceptance of the message of salvation and genuine fraternal love appears in several scriptural texts which we would do well to meditate upon, in order to appreciate all their consequences. The message is one which we often take for granted, and can repeat almost mechanically, without necessarily ensuring that it has a real effect on our lives and in our communities.
How does it continue as a part of the life of a disciple? Through prayer and reflection. In this attitude and praxis, we find an echo of the great mercy of God, a mercy we ourselves were given.
How dangerous and harmful this is, for it makes us lose our amazement, our excitement and our zeal for living the Gospel of fraternity and justice! God’s word teaches that our brothers and sisters are the prolongation of the incarnation for each of us: “As you did it to one of these, the least of my brethren, you did it to me” (Mt 25:40). The way we treat others has a transcendent dimension: “the measure you give will be the measure you get” (Mt 7:2). It corresponds to the mercy which God has shown us: “Be merciful, just as your Father is merciful. Do not judge, and you will not be judged; do not condemn, and you will not be condemned. Forgive, and you will be forgiven; give, and it will be given to you… For the measure you give will be the measure you get back” (Lk 6:36-38). What these passages make clear is the absolute priority of “going forth from ourselves towards our brothers and sisters” as one of the two great commandments which ground every moral norm and as the clearest sign for discerning spiritual growth in response to God’s completely free gift. For this reason, “the service of charity is also a constituent element of the Church’s mission and an indispensable expression of her very being”.[BENEDICT XVI, Motu Proprio Intima Ecclesiae Natura (11 November 2012)] By her very nature the Church is missionary; she abounds in effective charity and a compassion which understands, assists and promotes.
Caritas is part of the mission–there is no avoiding this. It is an explicit part of the Christian witness from the Gospels to the very last pope.