精勤(jīng qín) “practises intensively”
HD. 9.225b(世说新语); DK. 8.908c(晋代);
ps-L. 34c7.王闻仙言，欢喜踊跃，即随仙人，供给所须 ………… 于时奉事，经于千歳。为于法故，精勤给侍，令无所乏(p);
not found at K. 257.11; not found at Z. 105b9; not found at STF. 197b9;