尽忠竭力

Explanation: Exhaust: to do. Exhaustion of strength, all loyalty. 　　Source: Warring States Chu Qu Yuan "Buju": "Qu Yuan not only put in three years may not see an, dried intellectual loyal." 　　Examples: Designed to be toward the Tingzhao An, ~ patriotic, non dare to kill the love of money is good, the line Bushi unjust things. (Ming Shinai "Biography of Water Margin" fifty-sixth back)