make an extensive study of and accurate inquiry about (sth) ? 博學(xué)之，審問(wèn)之，慎思之，明辨之，篤行之。(《禮記·中庸》)To this attainment there are requisite the extensive study of what is good,accurate inquiry about it,careful reflection on it,the clear discrimination of it,and the earnest practice of it.