《淮南子·原道训》
因为先行者难以做得明智，后继者则容易取得成效；先行者爬上高处，后继者则可以跟着攀登而上，先行者越过低处，后继者则可以跟着踩踏前进，先行者跌进陷阱，后继者则可以考虑避免陷阱，先行者遭受失败，后继者则可以免蹈覆辙。
先者难为知，而后者易为攻也，先者上高，则后者攀之；先者逾下，则后者蹶之；先者颓陷，则后者以谋；先者败绩，则后者违之。
Because it is hard for the leader to do wisely, so it is easier for the follower to achieve results; the leader climbs up to a high place, then the follower can climb up following him; the leader passes by a low place, then the follower can follow and step forward; the leader falls into a trap, then the follower can consider to avoid the trap; the leader suffers from a failure, then the follower can avoid making the same mistake.