I have decided to read it again. Here is a quote that I really love from the beginning of chapter 1.
There are two different ways of being a person. One of these precedes the change of heart, and the other follows it. The first is fearful, anxious, resentful, and alienated from other people; the second, open resonant with others, buoyant, straightforward, and secure.
To the extent that we live the second way, we care about others. We do not see them merely in terms of our own interests, as helping or hindering us. They are real to us; we are as sensitive to their feelings and hopes and needs as we are to our own.