It is trivially easy to see when others are failing to understand or acting from self-interest, or being cruel or oppressive.

It is not only difficult to admit when we do the same thing, it is hard to even recognize it, because the transformation from third-person to first-person makes it virtually unrecognizable. But the practical ability to translate between first-person, third-person and second-person and to apply its harshest insights to oneself — that is wisdom.