“90% of achieving anything is about not quitting.”
That is, 90% of accomplishing anything is taken up in keeping ourselves from quitting, fighting through the urge to quit, convincing ourselves not to quit, distracting ourselves from quitting, not giving in to excuses for quitting, and convincing ourselves we still want to continue.
10% is the actual work of continuing.
Which, if true, says a lot about how much effort it takes us all not to sabotage ourselves.
Life, success: persistence.