If you have a God given talent, it is a must you apply hard work to it. Because that talent will not work itself, unless you do. It's just like one of the verses in the Bible which speaks about faith and how applying work towards that faith, gives it the power to manifest. And without the work, that faith basically dies. Well, it's the same thing with talents. Just because God gave you this talent or a particular skill, does not mean it will automatically bring your goals and dreams to life.
It's the work that you apply that manifests those things. Your talent is a key, a hammer, a brick; it's a resource to build off. Like a key will not open a door by itself, unless a person puts the key inside the keyhole and turns the knob. A hammer will not nail anything in, unless a person hammers it in. A brick does not construct a building by itself, unless a person applies those bricks to build.
Hard work is necessary, it requires sacrifices. Some might sacrifice sleep, some might be caught up in their work that they'll go a whole day without eating, some might sacrifice their time and etc. Sacrifice develops the determined will to succeed. Apply that with hard work and boom! You are liable to blow.
Hard work always pays off, it's an incentive with a priceless reward.