Wisdom is understanding yourself

From 33rd verse of the Tao Te Ching:

One who understands others has knowledge;

One who understands himself has wisdom.

Mastering others requires force;

Mastering the self needs strength.

A Tao-orientated life focuses on understanding yourself, rather than on the thinking and behaviours of others. You shift from the acquisition of information and the pursuit of status symbols to understanding and mastering yourself in any and all situations.

Wayne Dyer in "Change Your Thoughts Change Your Life" page 160-161