I've watched a documentary about Jobs and, before he got fired from Apple and went to NeXT, people who lived with him said he wasn't as harsh or serious, just stubborn. Also, after that event he went on to study zen buddhism.
That makes me wonder whether being fired changed his character so that he started making more conscious use of his "Yang" side. Before being fired, it seems he would just argue with directors and be at war with everybody in the company in a very immature way. Afterwards, it seems he was more harsh in the sense of demanding results and such. Given Apple was successful after his return, that probably reinforced his behavior.
That makes me wonder whether being fired changed his character so that he started making more conscious use of his "Yang" side. Before being fired, it seems he would just argue with directors and be at war with everybody in the company in a very immature way. Afterwards, it seems he was more harsh in the sense of demanding results and such. Given Apple was successful after his return, that probably reinforced his behavior.