“Anyone who can be trusted in little matters can also be trusted in important matters. But anyone who is dishonest in little matters will be dishonest in important matters.” — Luke 16:10 (CEV)
Little lies turn into big lies. If you are dishonest about little things, you are dishonest about big things.
In September of 2019 the President said in a tweet that Hurricane Dorian would likely hit Alabama, so residents of Alabama should be cautious.
A few minutes later the National Weather Service felt compelled to correct what the president had erroneously said. (After all, it is their job to predict weather as accurately as possible). So they corrected the president, saying that no, actually, Hurricane Dorian was not expected to hit Alabama. It was just a small error that most people would just shrug off when it was found to be false. Use humor, admit you were wrong, no big deal. But the president wouldn’t or couldn’t let it go, even going so far as bringing out a doctored map, a few days later, insisting that the original forecast included Alabama.
You can read about the whole sorry episode here: https://amp.theatlantic.com/amp/article/597469/
It isn’t my point to bring up old news; the point is the bible verse from Luke that says, if one is dishonest in a small thing, one will be dishonest in the big things.