Only in this sence, as the task of working on themselves (" to hearken and to hammer day and night "), may young people use the love that is given to them.
青年们应把爱当成他们的课业、他们工作的意义，并在其中(“昼夜不停地探索、锤炼”)去使用那些给予他们的爱。
We can make sence as following: a compliment with a smile presents your sincerity and encourage one to hard working;
我们可以理解为：带着微笑的赞扬，使人感到诚心，能催人奋进；
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