This is a very naive quote. Some people suck at certain things no matter how hard you try or practice...so naturally there will always be people that are better than you at certain things

Are you trying to tell me that you think that if you practiced writing enough you would be better than the greats? Better than Aristotle? Better than Dostoevsky? Chaucer?

If you're a parent, I certainly hope you don't teach your kids that they can be the best at anything they want provided they practice enough....you'd be setting your kids up for massive failures