《汉书·传·楚元王传》
所以贤圣的君主，广泛观察结局和开始，透彻地了解事理，而做到是非分明。
故贤圣之君，博观终始，穷极事情，而是非分明。
Therefore, the wise monarchs observe the endings and beginnings broadly, understand the issues thoroughly, and tell right from wrong. 