An invention can be so valuable as to be worthless to the inventor.

唯一能让你强大的是你自己的灵魂。

教育体系是以感官基础,以思考为过程,以自由为目的。

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

最初导致怀疑的相同原则，在一定程度上追求则会导向宗教。