One should never make friends with physicians, or with children, or with persons who are old, or with one's servants, O Yudhishthira. One should always provide for friends, for Brahmanas and for such as seek his protection. By doing this, O king, one acquires a long life. A wise man should live in such a house as has been constructed with the help of a Brahmana and an engineer skilled in his calling, if, indeed, O king, he seeks for his own behoof. One should not, O king, sleep at the evening twilight. Nor should one study at such hour for acquiring any any branch of knowledge.