千秋莫负
[qiān qiū mò fù]
'Qianqiu' here refers to a long period of time or eternity; 'Mo fu' means 'not辜负(gu_fu which stands for failing)'. It is a solemn pledge not to betray time. People often use it to inspire oneself and friends not to waste time but achieve great success, indicating ambition and responsibility toward one's career.