Evangelii Nuntiandi §10

10. This kingdom and this salvation, which are the key words of Jesus Christ's evangelization, are available to every human being as grace and mercy, and yet at the same time each individual must gain them by force - they belong to the violent, says the Lord,[24] through toil and suffering, through a life lived according to the Gospel, through abnegation and the cross, through the spirit of the beatitudes. But above all each individual gains them through a total interior renewal which the Gospel calls metanoia; it is a radical conversion, a profound change of mind and heart.[25]

24. Cf. Mt 11:12; Lk 16:16.

25. Cf. Mt 4:17.