直木必伐

Explanation: Naoki straight trees; cutting cut. Veteran trees will be felled. People tend to innocuous metaphor integrity. 　　Source: "Yizhoushu week I wish the" Oasis will be dried up, straight cutting of wood will. "" Zhuang Zi Mu Mountain, "the actual occurrence of the ranks of the non-exclusion, and death shall not harm outsiders, is free from suffering. Until the first cutting of wood, sweet dried well before."