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The idea of a margin of safety, a Graham precept, will never be obsolete. The idea of making the market your servant will never be obsolete. The idea of being objective and dispassionate will never be obsolete.
You can't manage what you don't measure - that's why transparency is the foundation of sustainable manufacturing.
小人也有坦荡之处,因为无所忌讳;君子亦有忧戚之处,因终生都忧国忧民。
不愿满足现状,愿意为了自己的痴迷而冒险过度,这就是艺术家与娱乐人士的区别。