The only limits that exist are the ones you place on yourself.
"The weight of history is carried by those who remember."
出自汉·桓宽《盐铁论·后刑》。锄去田里有害的杂草,禾苗就可以健康地生长;惩罚为非作歹的恶人,百姓就会感到喜悦。