Strike While the Iron is Hot

Take advantage of an opportunity immediately, while the conditions are most favorable.
In short: Timing + Action = Success.
It’s about acting fast, but not acting blindly. If the iron is hot but you don’t know where to strike, you can still ruin the work.
So, the proverb also implies: Prepare first, then move quickly when the moment arrives.
Origin
- Blacksmithing Roots: In metalworking, an iron bar must be struck with a hammer while it’s glowing hot and malleable. Wait too long, and it cools, hardens, and becomes unshapable.
- This physical process became a metaphor for acting at the peak moment in life, business, and relationships.