A good marksman may miss, the pitcher goes so often to the well that it is broken at last.
-or-
No matter how good a squirrel can jump, it will fall eventually.
(Sepandai-pandai tupai melompat, akhirnya jatuh ke tanah juga.)
To live from hand to mouth.
-or-
Barely making ends meet.
-or-
A chicken scratches up grain in the morning and in the afternoon.
(Kais pagi, makan pagi; kais petang, makan petang)
The pot calling the kettle black.
(五十步笑百步).
– a great and “useful” idiom in Chinese, to remind that, e.g. someone with split mind not to laugh at another person with split personality, and vice versa.