居安资深

Explanation: Describe to stay in school, accomplished deep. 　　Usage: Joint type; as predicate; means learning to master the strong and deep foundation 　　Source: Qin Meng Ke, "Mencius from the Lou down": "Gentlemen studies of the Road, also want their contentment. Contentment, the home of the security; ranks of the security, the capital of the deep; capital of the deep, then it's about every of its original. so the gentleman to see his contentment also. "