The problem is when we try to attain holiness on our own. That’s when it‘s unattainable.
In Ephesians the Bible speaks about the “washing of water with the word” Ephesians 5:26 (ASV). Jesus said His word is spirit and truth. He also said the truth shall set you free. That means the words of Christ can change our desires and release us from the burdens of sin that we struggle with. How great is your God? Can He change your desires?