Don Brash's autobiography, Incredible Luck, is proof aplenty that when it comes to forging a successful career in politics, you can have all the attributes you think you need - charisma, charm, intelligence, vision, the capacity to persuade, the ability to communicate, personnel management skills and so forth - but you need one thing above everything else.
That thing is an innate sixth sense which alerts you to hidden traps and pending trouble, tells you what is politically possible and what is not, and ensures you come out of any argument occupying the high ground, moral or otherwise.
In that regard, Parliament is a great leveller. From the first pages of the book, it is evident Brash lacked the necessary political smarts. After standing down as National's leader, Brash assumed John Key, the man who replaced him would offer him the shadow finance portfolio, partly to keep at bay Bill English who Brash believed still hankered for the leadership he had lost to Brash three years earlier.
Even Brash now realises this was naive in the extreme. It also demonstrated a failure to appreciate the dynamics of the National caucus of which Brash should have been well-versed.
Key instead offered him Tertiary Education and a ranking on National's second bench. Brash got the message he was not wanted and immediately quit politics.