Once the Bodhisatta was born as a rich merchant in Bārāṇasī. One day his son, sitting on his lap, asked him for one word that comprehended all things. The Bodhisatta said it was “skill” (dakkhayya). The story was told in reference to a lad in Sāvatthi who asked his father a question regarding the entrance to the Path (dvārapañha). The father, not being able to answer the boy, brought him to the Buddha. J.ii.236 f.