- 积习难改 jīxínángǎi old habits die hardOld habits or long-established practices are difficult to change or break.
- 积习成俗 jīxíchéngsú old habits become customold habits or long-established practices eventually become a social custom; what is done long enough becomes a tradition
- 积习成常 jīxíchéngcháng long-standing habits become the normA practice that is followed for a long time eventually becomes a habit or custom, and is then regarded as normal or commonplace.
