I'm going with Coolidge on this one.
"Nothing in the world can take the place of Persistence...
This is not true, to quote Kurt von Hammerstein:
I divide my officers into four groups. There are clever, diligent, stupid, and lazy officers. Usually two characteristics are combined. Some are clever and diligent -- their place is the General Staff. The next lot are stupid and lazy -- they make up 90 percent of every army and are suited to routine duties. Anyone who is both clever and lazy is qualified for the highest leadership duties, because he possesses the intellectual clarity and the composure necessary for difficult decisions. One must beware of anyone who is stupid and diligent -- he must not be entrusted with any responsibility because he will always cause only mischief.
I seen plenty of programmers that are persistent but their code is flawed on so many levels that if I wrote that code myself it would save me time over convincing managers that their code needs fixing and fixing it.