I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.
君子有九种事情需要考虑到：看，要考虑是否清楚；听，要考虑是否明确；脸色，要考虑是否温和；容貌，要考虑是否恭敬；言语，要考虑是否忠实；做事，要考虑是否认真；疑惑，要考虑是否求教；愤怒，要考虑是否有后患；利益当前，要考虑是否该伸手。
The more we learn about black holes, the more we realize how much we still don’t know.
Stop being afraid of what could go wrong and start being excited about what could go right.