What is called a great minister is one who serves his prince according to what is right; and when he finds he cannot do so, retires.

Confucius (c. 551- c. 479 BC) Chinese philosopher, sage, politician [孔夫子 (Kǒng Fūzǐ, K'ung Fu-tzu, K'ung Fu Tse), 孔子 (Kǒngzǐ, Chungni), 孔丘 (Kǒng Qiū, K'ung Ch'iu)]
The Analects [Lun Yü], 11.23 (6th C. BC) [ed. Lao-Tse; tr. Legge (1861)]
    (Source)

Alt. trans.:

• "Men I call statesmen are those who will serve their master according to their sense of duty; who, however, when they find they cannot do that, consistently, with their sense of duty, will resign." [tr. Ku Hung-Ming (1898)]
• "Those whom we call 'great ministers' are such as serve their prince conscientiously, and who, when they cannot do so, retire." [tr. Wilson (1900)]
• "He who may be called a great minister is one who serves his Prince according to the right, and when that cannot be, resigns." [tr. Soothill (1910)]
• "A great minister is a minister who serves his lord by following the Way, and who resigns as soon as the two are no longer reconcilable." [tr. Leys (1997)]