Thinking is easy, acting is difficult, and to put one's thoughts into action is the most difficult thing in the world.

Thinking is easy, acting is difficult, and to put one's thoughts into action is the most difficult thing in the world.

思考是容易的，行动是困难的，把一个人的思想付诸行动是世界上最困难的事情。

-- Johann Wolfgang von Goethe 约翰·沃尔夫冈·冯·歌德