If you find serenity and happiness，they may be jealous；Be happy anyway。People really need help but may attack you if you do help them。

他在主张杠杆原理时所说。

【释义】当商品价格高涨时，要像对待粪土一样迅速出售；当商品价格低廉时，要像对待珠玉一样大量购入。

成功不在于终点，而在于旅程。

In computational learning theory, we seek to understand the fundamental principles that govern learning from data.