8909. Verse 17 You shall not covet your neighbour's house; you shall not covet your neighbour's wife, nor his male slave nor his female slave, nor his ox nor his ass, nor anything that is your neighbour's means that one must be on one's guard against self-love and love of the world, and so one must take care to prevent the evils contained in the preceding commandments from becoming present in the will and consequently going out of it.

6704. The general belief at the present day is that all are equally the neighbour and that benefits should be conferred on whoever is in need. But Christian prudence requires one to examine carefully the kind of life a person leads and to exercise charity in whatever way that life demands. When someone belonging to the internal Church does this he uses discretion and so acts intelligently, whereas someone belonging to the external Church does it without discretion because he is less able to tell one thing from another.