All water has a perfect memory and is forever trying to get back to where it was.
In the short run, the market is a voting machine but in the long run, it is a weighing machine.
不過是君主不把它［愛人利人］用在政事上,士大夫也不把它付諸行動罷了。
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.