由俭入奢易，由奢入俭难
yóu​jiǎn​rù​shē​yì​yóu​shē​rù​jiǎn​nán

from frugality to extravagance is easy, but from extravagance to frugality is hard

由俭入奢易，由奢入俭难 由儉入奢易，由奢入儉難 yóu​jiǎn​rù​shē​yì​yóu​shē​rù​jiǎn​nán
from frugality to extravagance is easy, but from extravagance to frugality is hard
(idiom) it is easy to go from being thrifty to being wasteful, but very difficult to return to a simple life after being used to luxury