Success or failure depends ...

Success or failure depends more upon attitude than upon capacity.
Success or failure depends more upon attitude than upon capacity.

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Being self-made is a state of mind, and once you put that mentality to work, your success will come.
 Dave East
A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
 Dave East
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
Don't settle in the land of barely enough. That is where you are, it is not who you are. That's your location, it's not your identity. No matter what it looks like, have an abundant mentality.
Everything in your life, every experience, every relationship is a mirror of the mental pattern that is going on inside of you.

Quotes from the same author

Most people never run far enough on their first wind to find out they've got a second.
To change one's life, start immediately, do it flamboyantly, no exceptions.
The greatest discovery of our generation is that human beings can alter their lives by altering their attitudes of mind. As you think, so shall you be.
The deepest craving of human nature is the need to be appreciated.
Pretend what we may, the whole man within us is at work when we form our philosophical opinions.