Remind yourself regularly ...

Remind yourself regularly that you are better than you think you are. Successful people are not superhuman. Success does not require a super-intellect. Nor is there anything mystical about success. And success isn't based on luck. Successful people are just ordinary folks who have developed belief in themselves and what they do. Never...yes, never...sell yourself short.
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 David J. Schwartz

Quotes from the same author

The test of a successful person is not an ability to eliminate all problems before they arise, but to meet and work out difficulties when they do arise.
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 David J. Schwartz
Those who believe they can move mountains, do. Those who believe they can't, cannot. Belief triggers the power to do.
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 David J. Schwartz
The person determined to achieve maximum success learns the principle that progress is made one step at a time.
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 David J. Schwartz
Believe Big. The size of your success is determined by the size of your belief. Think little goals and expect little achievements. Think big goals and win big success. Remember this, too! Big ideas and big plans are often easier -certainly no more difficult - than small ideas and small plans.
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 David J. Schwartz
Persons who reach the higher rungs in business management, selling, engineering, religious work, writing, acting, and in every other pursuit get there by following conscientiously and continuously a plan for self-development and growth.
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 David J. Schwartz