The phrase don’t make a mountain out of a molehill means don’t turn a small problem into a huge one. It reminds you to keep things in perspective.
A molehill is a small mound of dirt and a mountain is huge, so the mental image is a funny contrast.
A molehill is a small mound of dirt and a mountain is huge, so the mental image is a funny contrast.
It was a tiny mistake, so calm down and don’t make a mountain out of a molehill.