Arnold and Bill both like to sing. Arnold sings in several groups (including a chorus), takes voice and ear-training lessons, and continually strives to improve

Arnold and Bill both like to sing. Arnold sings in several groups (including a chorus), takes voice and ear-training lessons, and continually strives to improve. Bill sings in the same chorus as Arnold, but otherwise he doesn't practice. Nevertheless, Bill is a much better singer than Arnold. If you haven't ever seen this phenomenon, you simply don't have much experience with activities that require both talent and skill in order to excel. You can't reach the highest levels without practice—Bill could never compete with Charlie, who has Bill's talent and works as hard as Arnold—but that's not enough. Talent and practice are both necessary to be the best, but neither one alone is sufficient.