Humility

Here's a really good story from One Minute Wisdom by Anthony de Mello:

To a visitor who described himself as a seeker after Truth the Master said, "If what you seek is Truth, there is one thing you must have above all else."

"I know. An overwhelming passion for it."

"No. An unremitting readiness to admit you may be wrong."

It seems so obvious, doesn't it? But it's so very hard for many people. Think about it, though. Don't we experience it as being very unattractive when other people can't admit they're wrong? So it is appropriate to cultivate that ability in ourselves. It's really a relief when we do so.