It is not the young people that degenerate,they are not spoiled till those of mature age are already sunk into corruption.

Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt.

What has destroyed every previous civilization has been the tendency to the unequal distribution of wealth and power.

The march of invention has clothed mankind with powers of which a century ago the boldest imagination could not have dreamt.

年轻人并不堕落；他们只有在成年人已经堕落时才会被宠坏。

人们变得文明，不在于他们愿意相信的程度，而在于他们愿意怀疑的程度。

毁灭过往所有文明的原因在于财富和权力的不均分配倾向。

发明的进步使人类拥有了世纪前最大胆的想象也无法梦见的力量。