Effort in any field has the property that if you are bloody-minded enough it can bring you up to the wall beyond which talent lies. I hit this wall as a result of over-practicing piano aged 28 which I had to give up due to repetitive strain injury. The good news is that a few years later, in a separate development, the wall suddenly and completely dissolved. I can't describe the experience without sounding mystical. Still less can I explain it. The closest psychological concept I've found is Low Latent Inhibition and my guess is that this phenomenon lies behind all talent.