It is better to waste one's youth than to do nothing with it at all.
——George Courteline (1858-1926)
年轻时做一点儿事要比什么事也不做好。
——乔治·库特林

A generation without a cause in its youth has no legacy in its old age. Eeward Kennedy. American plliticia 一代人如果年轻时候没有事业,老了就不会有遗产可以传下去。 美国政治家肯尼迪.

Youth is more courageous than age because it knows less. Age is wiser than youth because it knows more.
青年人比老年人勇气大，因为他们知道的比较少。老年人比青年人明智，因为他们知道的较多。——W.E.B.DuBois

To make good use of life one should have in youth the experience of advanced years, and in old age the vigor of youth. (Stanislars I, Polish king)
青年而有老年之经验，老年而有青年之朝气，就能使人生发挥更大的作用。(波兰国王 斯坦尼劳斯一世)