事理明白则心愈能清楚而专一,心能专一则事理愈能通达流畅。
You must not think that what is hard for you to master is humanly impossible; and if it is humanly possible, consider it to be within your reach.
读书的人死前活过千次,不读书的人只活一次。
Every great advance in natural knowledge has involved the absolute rejection of authority.