From a Catholic perspective, besides the Bible of course.
I think every catholic book that references self/others touches upon this. What I’ve seen (and read) were such books on specific aspects (like marriage/friendship). During the jubilee of mercy several books were published dealing with specific works of mercy applied to our relationship with others. I’ve read a few in that sense with a mystical dimension, and others breaking things down in terms of modern psychology.
In a word, the issue in the title of your thread is:“broad”.
(yet valid !! and your outlook is enough to build on whatever catholic book you come across and happen to read.)
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