Catechism of the Catholic Church
a. Para. 549: By freeing some individuals from the earthly evils of hunger, injustice, illness, and death (cf. Jn 6:5-15; Lk 19:8; Mt 11:5), Jesus performed messianic signs. Nevertheless he did not come to abolish all evils here below (Cf. Lk 12:13-14; Jn 18:36), but to free men from the gravest slavery, sin, which thwarts them in their vocation as God's sons and causes all forms of human bondage (Cf. Jn 8:34-36).
Para. 542: Christ stands at the heart of this gathering of men into the "family of God." By his word, through signs that manifest the reign of God, and by sending out his disciples, Jesus calls all people to come together around him.
Para. 544: The kingdom belongs to the poor and lowly, which means those who have accepted it with humble hearts.
Para. 553: Jesus entrusted a specific authority to Peter: "I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven" (Mt 16:19). The "power of the keys" designates authority to govern the house of God, which is the Church.
Para. 547: Jesus accompanies his words with many "mighty works and wonders and signs," which manifest that the kingdom is present in him and attest that he was the promised Messiah (Acts 2:22; cf. Lk 7:18-23).