Damn evil guy. There's a chinese saying
人 之 初
ren zhi chu
People at birth
性 本 善
xing ben shan
Are naturally good
性 相 近
xing xiang jin
Their natures are similar
習 相 遠
xi xiang yuan
Their habits become different
苟 不 教
gou bu jiao
If negligently or foolishly, not taught,
性 乃 遷
xing nai qian
Their nature deteriorate/widely differ
教 之 道
jiao zhi dao
The right way to teach,
貴 以 專
gui yi zhuan
Is with absolute concentration/thoroughness
Reflect badly on parents.