This practice of bonsai seems to often bring up opportunities for me to think on the following Taoist parable. I think of it whenever something goes "wrong" -- branch gets bent too far and breaks, tree dies, cut made too far past the point you wanted it to be, etc. -- and it ends up leading to something unexpected such as motivation to learn a new technique or skill, buy a new tree, or it adds some interesting character to the tree I'm working on.
"There was once an old farmer who had worked his crops for many years. One day, his horse ran away. Upon hearing the news, his neighbors came to visit. 'Such bad luck,' they said sympathetically. 'Maybe,' the farmer replied.
The next morning the horse returned, bringing with it two wild horses. 'Such good luck!' the neighbors exclaimed. 'Maybe,' replied the farmer.
The following day, his son tried to ride one of the untamed horses, was thrown off, and broke his leg. Again, the neighbors came to offer their sympathy on his misfortunate. 'Such bad luck,' they said. 'Maybe,' answered the farmer.
The day after that, military officials came to the village to draft young men into the army to fight in a war. Seeing that the son's leg was broken, they passed him by. 'Such good luck!' cried the neighbors. 'Maybe,' said the farmer."