The only limit to our realization of tomorrow is our doubts of today.
实现明天理想的唯一障碍是今天的疑虑。
The best way to understand something is to try to change it.
"I write to destroy the truth, but I always end up creating it."
对幼儿来说,妈妈的声音是具有特殊意义的参照物。
任何工厂中最危险的化学品不是罐子里的那些,而是自满情绪。