The only people who cannot change are the most wise and the most stupid.
Don't let your past determine your destiny.
The failure to cultivate virtue, the failure to examine and analyze what I have learned, the inability to move toward righteousness after being shown the way, the inability to correct my faults-these are the causes of my grief.
There is only one thing in life which never changes, and it is change.
Time flows away like the water in the river.
Gentlemen should not waste their time on trivial games -- they should play go[3]