The architect must be a master of light and shadow.
数学不是一项观赏性运动；要理解它，必须积极参与其中。
我一直是诗歌的囚徒。
比如说，你下午四点钟来。那么从三点钟起，我就开始感到幸福。时间越临近，我就越感到幸福。到了四点钟的时候，我就会坐立不安：我就会发现幸福的代价。
Faith is the sense of life, that sense by virtue of which man does not destroy himself, but continues to live on.
The child is not a passive recipient of knowledge but an active participant in the learning process.
儿童不是知识的被动接受者，而是学习过程的积极参与者。