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“Whatever the mind can conceive and believe, the mind can achieve.” (Napoleon Hill)

- As quoted in Self-Motivation Through Risk Taking! : Are You Leading Or Do You Wither with Problems? (2005)
As one of the pioneers of self-empowerment literature, this quote is famously attributed to Hill, though no further specific contextual information is available.

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Your big opportunity may be right where you are now.

Your ability to use the principle of autosuggestion will depend, very largely, upon your capacity to concentrate upon a given desire until that desire becomes a burning obsession.

You might well remember that nothing can bring you success but yourself.

You give before you get.

You can start right where you stand and apply the habit of going the extra mile by rendering more service and better service than you are now being paid for.

Wise men, when in doubt whether to speak or to keep quiet, give themselves the benefit of the doubt, and remain silent.

When your desires are strong enough you will appear to possess superhuman powers to achieve.

When defeat comes, accept it as a signal that your plans are not sound, rebuild those plans, and set sail once more toward your coveted goal.

We begin to see, therefore, the importance of selecting our environment with the greatest of care, because environment is the mental feeding ground out of which the food that goes into our minds is extracted.