不塞不流，不止不行
bù​sè​bù​liú​bù​zhǐ​bù​xíng

no flow without a block

不塞不流，不止不行 bù​sè​bù​liú​bù​zhǐ​bù​xíng
no flow without a block
If you do not block one thing, another cannot flow; if you do not stop one thing, another cannot move forward. This proverb means that unless old or harmful ideas are abolished, new or correct ones cannot be established or promoted.