Featured in Wu Jingzi's 《儒林外史》 (Qing novel): Prefect Xiang tells the young Ji scholar that his looks and bearing mean 'his future will be without limit (将来不可限量).' The phrase has stayed glued to talk of youth, talent, and emerging markets ever since.
usage
Almost always predicates 前景 / 前途 / 潜力 / 发展 — prospects, prospects, potential. For physical size use 无限大 instead.
