人活着只有两件事，忙着活，忙着死。
The essential thing in life is not so much conquering as fighting well.
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。
Never let age be a barrier to learning or discovery.
关于人性，唯一真正知道的是它是会变化的。