Strike while the iron is hot

Have you ever seen a blacksmith at work? Or maybe an artisan shaping hot glass? It's pretty incredible to watch, right? (If not, visit Shanga Foundation in Arusha or check out video links below)
In our everyday experience, glass is hard, brittle and breakable, but glass is actually made by melting sand and shaping it like liquid.

Some things in life seem unchangeable; they just will not bend. If we use all our strength, they only shatter in our hands and hurt us. But a skillful craftsman can make brittle things soft and malleable by preparing them appropriately, and taking decisive action at the right moment.

This proverb is often used to mean that you should take action quickly when an opportunity arises, so that you don't miss it. See also: There is a tide

However, it's worth noting that in the play, this advice has pretty bad consequences for Brutus, who didn't exactly sail on to fortune after this speech (read more...)

Many cultures and languages have a proverb that is very similar to "Strike while the iron is hot." It seems likely that the proverb has multiple independent origins.