Lch s, n dy chng ta v di sn ca chng ta, khai sng v cho chng ta bit v nhng cuc u tranh trong qu kh v c th gip lm sng t cc s kin hin ti. Tht vy, bng cch nghin cu v suy ngm v s kin v nhn vt lch s, chng ta c th c c kin thc v qu trnh theo ui trong hin ti.Chng ti nghin cu qu kh hiu hin ti; chng ti hiu hin ti nh hng cho tng lai. William Lund
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