Leave something alone; avoid attempting to correct, fix, or improve what is already sufficient (often with an implication that the attempted improvement is risky and might backfire).

Alternative form of if it ain't broke, don't fix it

It is often fruitless to help people that are stupid and do stupid things.

(proverbial) To deal with a problem or potential problem while conditions are favorable.

In a fixed manner: steadily, without shifting one's gaze. / In a fixed manner: unchangingly, without changing one's expression. / Firmly, resolutely.

plural of fixedness

The state or condition of being fixed.