翻譯名義集 5.141

5.141

The Nirvāṇa-sūtra says: 'For example, an elder had only one son, whom he constantly kept in mind, with boundless love and affection. He took him to a teacher wishing to have him study, but fearing he would not finish quickly, he soon brought him back. Because of his loving thought, day and night with diligence he taught him the half-character [alphabet] and did not instruct him in the Vyākaraṇa treatise. Why is this? Because being young, his strength was not yet adequate.'