True wisdom is less presuming than
folly.
The wise man doubts often,
and change his mind;
the fool is obstinate and doubts not;
he knows all things but his own ignorance....
Be capable of change in that which right
and men will rely on you.
Establish in your principles of action
see that you never act according to them.
First know that your principles are just
then act.
Akhenaton,
King of Egypt, 14th Century