bīng qiáng ér wú yì zhě cán 兵强而无义者残
A Strong Army Without Righteousness Is Destructive.
A state that has a strong army but acts without righteousness is bound to be destructive. Since ancient times, all rulers with high ideals have pursued a wealthy state and a strong army. However, there is a more important principle than this, i.e., the principle of righteousness which is a supreme ethical pursuit of the Chinese nation that is above all material interests. A strong army that practices no righteousness is bound to bring harm.
It is dangerous to become untrustworthy following success. A strong army without righteousness is destructive. (Guanzi)