The school of life is always open, if you aren't learning more, you are falling further behind - Charlie Munger

Without numerical fluency , in the part of life most of us inhibit , you are like a one-legged man in an ass-kicking contest.

Quickly eliminate the big universe of what not to do; follow up with a fluent, multidisciplinary attack on what remains; then act decisively when, and only when, the right circumstances appear.

The first helpful notion is that it is usually best to simplify problems by deciding big no-brainer questions first.