Bù huàn mò jǐ zhī, qiú wèi kězhī yě.
不患莫己知, 求为可知也。
A gentleman is not concerned about not known to others. He pursuits what makes him worthy to be known.
不 not, no;
患 worry, trouble;
莫 no, do not, none;
己 oneself;
知 know, be aware of;
莫己知 = 莫知己;
求 seek, ask, demand;
为 by, serve as;
可 can;
为 for - prep.