過ちて改めざる是を過ちという
あやまちてあらためざるこれをあやまちという
a man who has committed a mistake and doesn't correct it is committing another mistake
過ちを改める is read as あやまちをあらためる (ayamachioaratameru) and means to correct a fault.
あやまちをあらためる
ayamachioaratameru
あやまちてあらためざるこれをあやまちという
a man who has committed a mistake and doesn't correct it is committing another mistake
まあ、過ちを改めるに遅すぎるということはない。
Well, there's no such thing as being too late to correct one's faults.