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.

抱最好的希望，做最坏的打算。

过去从未死去，它甚至还未过去。

The best things in life are free.

创新是取胜的唯一途径