吾十有五而志于学,三十而立,四十而不惑,五十而知天命,六十而耳顺,七十而从心所欲,不逾矩。· At the age of fifteen,I set my heart on learning; at thirty,I was already well established; at forty I began to be immune from confusion; at the age of fifty,I could understand Heaven's will; at the age of sixty,I felt no surprise at any opinion; and in my seventies,I have been able to do whatever I intend to without transgressing the rules.