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:
"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
in the Televised movie, "THE VERNON JOHNS STORY" (available on DVD)