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"知人者智，自知者明。胜人者有力，自胜者强。"
— 老子
1
"Do not wait to strike till the iron is hot; but make it hot by striking."
— William Butler Yeats
"Do not wait to strike till the iron is hot; but make it hot by striking."
— William Butler Yeats
"知人者智，自知者明。胜人者有力，自胜者强。"
— 老子
"往者不可谏，来者犹可追。"
— 《论语》