Zen Mind, Beginner's Mind
Zen mind, Buddha mind, is beginner's mind. The expert who retains the wonder of the mind of a beginner continues learning more and more on his craft, becoming more and more an expert. The beginner doesn't know, so he must have an open mind, willing to learn. Thus a master is always a student.
Keeping Beginner's Mind
Everyone is reborn with change every moment. That is the simple nature of Zen. Life is measured in units of time. There is no escaping or bypassing the laws of physics when it comes to time. Therefore, we must forgive the past, even if it seems to happen now. That time is over.