Evangelii Gaudium §45

45. We see then that the task of evangelization operates within the limits of language and of circumstances. It constantly seeks to communicate more effectively the truth of the Gospel in a specific context, without renouncing the truth, the goodness and the light which it can bring whenever perfection is not possible. A missionary heart is aware of these limits and makes itself “weak with the weak... everything for everyone” (1 Cor 9:22). It never closes itself off, never retreats into its own security, never opts for rigidity and defensiveness. It realizes that it has to grow in its own understanding of the Gospel and in discerning the paths of the Spirit, and so it always does what good it can, even if in the process, its shoes get soiled by the mud of the street.