君子上交不谄，下交不渎。
翻译：道德高尚的人，与地位比自己高的人交往，不奉承讨好；与地位比自己低的人交往，不轻慢高傲。
即使在抽象中，数学也具有深远的现实应用。
The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.
In mathematics, the journey of discovery is as important as the destination.
Life was simple before World War II. After that, we had systems.