If winter comes , can spring be far behind ?( P. B. Shelley , British poet ) 冬天来了，春天还会远吗?( 英国诗人, 雪莱. P. B.) If you doubt yourself , then indeed you stand on shaky11 ground .( Ibsen , Norwegian dramatist ) 如果你怀疑自己，那么你的立足点确实不稳固了。 (挪威剧作家 易卜生)

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　　If you would go up high , then use your own legs ! Do not let yourselves carried aloft; do not seat yourselves on other people's backs and heads . (F. W . Nietzsche , German Philosopher) 如果你想走到高处，就要使用自己的两条腿!不要让别人把你抬到高处;不要坐在别人的背上和头上。(德国哲学家 尼采. F. W.)

　　It is at our mother's knee that we acquire our noblest and truest and highest , but there is seldom any money in them.( Mark Twain , American writer )