translation.en: Mark Twain says that proper preparation, or teaching, is so powerful that it can turn bad morals to good, it can turn awful practices into powerful ones, it can change men and transform them into angels.
translation.zh: 马克·吐温说适当的准备或教学， 是非常强大的， 可以将不好的品行变好， 将糟糕的实践变得强有力， 将人们改变， 并将他们改造成为天使。