From 《
孟子·
告子下》 (Mencius, 'Gaozi II'):
天将降大任于斯人也,必先苦其心志,劳其筋骨,饿其体肤,空乏其身,行拂乱其所为,所以动心忍性,曾益其所不能 - 'Heaven, about to entrust a great mission, first embitters his heart, works his bones, starves his flesh, empties his being, disorders all he does, thereby stirring the heart and tempering the nature, and adding to what he could not before.' The canonical Chinese 'adversity builds character' passage.