如果你想飞翔,就必须放弃那些拖累你的事物。
Sometimes the simplest melodies carry the deepest emotions.
A good mathematician is someone who can see analogies between theorems; a great mathematician is someone who can see analogies between analogies.
In the past the man has been first; in the future the system must be first.
The deepest theorems often arise from the simplest observations.