The man who is fit to work at any particular trade is unable to understand the science of that trade without the help and guidance of those who are working with him or over him.
适合从事任何特定行业的人，如果没有与他一起工作或在他之上的人的帮助和指导，就无法理解该行业的科学。
【释义】想要成就一番事业，必须先建立坚定的自信；想要胜过他人，必须先克服自身的缺点与不足。
The nation that destroys its soil destroys itself.
I still haven’t found what I’m looking for.