Willpower
Here is a link to an interesting article "Willpower is best used with care," on the findings of psychologists that self-control is more determinate of success than talent, that willpower can be strengthened like a muscle through excercise, and that it can be fatigued and depleted. Excerpt:
... the general principle - not to spread our inner resolve too thin - is an important one. If you are about to embark on a big project you court disaster if at the same time your life is cluttered and demanding, or you also commit to draining attempts at self-enhancement. The would-be novelist whose taxing day job exhausts her moral muscle will find it harder to apply the seat of her trousers to the seat of her chair. The dieting philosopher will struggle to keep his attention on a tricky passage of Friedrich Nietzsche.
... the general principle - not to spread our inner resolve too thin - is an important one. If you are about to embark on a big project you court disaster if at the same time your life is cluttered and demanding, or you also commit to draining attempts at self-enhancement. The would-be novelist whose taxing day job exhausts her moral muscle will find it harder to apply the seat of her trousers to the seat of her chair. The dieting philosopher will struggle to keep his attention on a tricky passage of Friedrich Nietzsche.