Wiktionary
prov. Everyone makes mistakes.
Wikipedia
To Err is Human: Building a Safer Health System is a report issued in November 1999 by the U.S. Institute of Medicine that may have resulted in increased awareness of U.S. medical errors. The push for patient safety that followed its release continues. The report was based upon analysis of multiple studies by a variety of organizations and concluded that between 44,000 to 98,000 people die each year as a result of preventable medical errors. For comparison, fewer than 50,000 people died of Alzheimer's disease and 17,000 died of illicit drug use in the same year.
The report called for a comprehensive effort by health care providers, government, consumers, and others. Claiming knowledge of how to prevent these errors already existed, it set a minimum goal of 50 percent reduction in errors over the next five years. Though not currently quantified, this ambitious goal has yet to be met.
Usage examples of "to err is human".
The proverb runs: To err is human, but to persist in sin is the work of the devil.
For does not Jesus say that to err is human, but to forgive divine?