即使在艰难时刻，我也总是努力保持积极。

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.

有钱人说真话有人相信，贫穷人说话别人怀疑不相信。

战略不是预测未来，而是为未来做好准备。

The most important thing is to awaken in the child his own will and ability to create.

"The world is full of obvious things which nobody by any chance ever observes."

创新不是为了与众不同，而是为了做得更好。