The only limit to our realization of tomorrow will be our doubts of today.
Life can only be understood backwards; but it must be lived forwards.
当老人们种下他们知道自己永远不会坐在其下的树时,社会就会变得伟大。
La literatura es una mentira que dice la verdad.
解析:意与知、物紧密相连。
"To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others."