A screw can only withstand so much torque before it shears or the threads are stripped.

A certain amount of torque is optimal.

Tighter, therefore, is not always better. More is not always best.

The hard part is knowing when to stop. The hard part is having the discipline to stop turning before you break something.

There’s a metaphor here, and I’m sure you can think of an area of your life where it applies.