Hello Hank: I agree with Patrick's answer.
We may well note that "success" is not the subject of the quotation.
We may also note that it does not mean that Genius---Is---Needed.
It simply means that few people demonstrate Courage. For example, here is a quote from one of my heroes, Dr. Martin Luther King, Jr on the subject of courage:
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"When I say to you; 'Don't even be afraid, you know what I really mean?'
For I submit to you tonight, that no man is free, if he fears death;
but the minute that you conquer the fear of death, at that moment, you're free.
You must say somehow; 'I don't have much money. I don't have much education.
I may not be able to read and write; but I have the capacity to die!'
And I say to all, ...the man that will not die for something, is not fit to live." ----from a sermon by Pastor Martin Luther King,
who succeeded Pastor Vernon Johns at the Dexter Avenue Baptist Church in
Montgomery, Alabama,
in the Televised movie, "THE VERNON JOHNS STORY" (available on DVD)