Story highlights "Take responsibility, and don't just lash out at others," Trump wrote in 2007.

Trump: "People who take responsibility have no need to blame or continually find fault with others."

(CNN) Donald Trump continued to cast doubt on the legitimacy of a potential Hillary Clinton victory on Election Day, telling those gathered at a rally Thursday he will accept the results of next month's election if he wins.

In doing so, the Republican presidential nominee appears to be ignoring his own advice, which he dished out in a 2007 Trump University book, "Trump 101: The Way to Success."

"When things go wrong, look at yourself first," Trump wrote. "Don't instinctively blame others or the circumstances — or use them to cover your behind. Be the leader; stand tall, and take the hit. If you accept the glory, be willing to accept blame."

Trump continued, "Nip problems in the bud before they grow into more serious and hard-to-solve issues. In other words, take responsibility. People who take responsibility have no need to blame or continually find fault with others. Naysayers rarely contribute much, and they usually don't amount to much. By now, I've been in business long enough to have had ups and downs. I've enjoyed magnificent victories and suffered painful defeats. I've learned to go quickly from seeing problems to seeing their solutions. The secret to resolving problems is to emphasize the solution more than the problem; accentuate the positive without ignoring the negative."

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