Specialization is almost always forced by limitation. Restriction (enforced from the inside) rarely works. Limitation (imposed from the outside) is the only force powerful enough to ensure true specialization. Without specialization, we do not find extremes, and without extremes, we do not find giants in terms of performance. A multitude of abilities and capacities is sometimes more of a curse than a blessing. Rarely is it accompanied by the will to enforce enough restriction. Limitation must be imposed, or this remarkable set of abilities will never coalesce into ultimate performance.