This short article is by Mike Licona. He begins:
If your mother claims that you are an honest person, we may trust you that you will do what you say. Yet some reservation is understandable on our part, since your mother loves you and is looking out for your best interests. Therefore, she is considered a biased source. This does not mean that she is wrong or that her words about you are without merit. However, if someone who hates you tells us that he wants to see you fall, but your honesty is keeping that from happening, then we can be even more comfortable that you are an honest person.
The full article via bethinking.org – Bible + Jesus – The Sweet Words of an Enemy.