Talent is helpful, but it's hard work, persistence and grit that unlock talent and turn capable people into success stories. As Thomas Edison so famously said, "Genius is 1% inspiration and 99% perspiration." Practice with being persistent, including the chance to struggle and learn how to overcome struggle, will help kids later have ability to wade through and make sense of confusing new information, navigate difficult situations, and solve tough problems.
Further, studies like those discussed in Po Bronson and Ashley Merryman's NurtureShock tell us that kids will actually perform better when we praise their hard work instead of just telling them how smart or great they are. As parents, we also tend to offer kids activities which are enjoyable and attainable and, as such, too easy. Bear in mind that if we spare them frustration, we actually deny them the chance to work hard and develop persistence and grit.