1. Tri thc l ngun kin thc ca con ngi. Nhng nu chng ta khng thu lm tri thc khi cn tr th n s khng cho bng rm lc v gi.L. Chesterfield

2. Khng nn ni tt c nhng g bn bit nhng bao gi cng phi bit nhng g bn ni. M. Claudius 3. Nh trng ch cho chng ta chic cha kha tri thc, hc trong cuc sng l cng vic c i. Bill Gates