The Roman emperor, Marcus Aurelius, once said:
“It never ceases to amaze me: we all love ourselves more than other people, but care more about their opinion than our own.”
– Marcus Aurelius
The tendency of people is to view the world through one’s own viewpoint and understanding.
At the same time, people are always carefully watching how others perceive them.
It is possible that with enough social conditioning we see ourselves in others.
Perhaps this is what underlies the fact that we value others as ourselves.