"An error is the more dangerous in proportion to the degree of truth which it contains"

This quote by Henri Frederic Amiel suggests that mistakes can be more harmful when they consist of a degree of reality. This suggests that when an error contains some fact, it can be more difficult to determine and remedy. This is due to the fact that the truth within the error can make it appear more credible and valid. It can likewise be harder to identify the source of the mistake when it contains some fact. This can lead to the mistake being perpetuated and accepted as truth, which can have serious effects. For that reason, it is important to be familiar with the possible threat of errors which contain some reality and to take extra care to recognize and correct them.