The only limit to our realization of tomorrow will be our doubts of today.
最大的风险是不冒任何风险。
【释义】:和品德好的人相处,就像进入放满香草的屋子,久了也会染上香气;与恶人交往,如同走进卖臭鱼的店铺,久了也会变臭。  
Sustainability isn't an option - it's our responsibility to the next generation.