Make hay while the sun shines:

If you make hay while the sun shines, you make good use of the chance to do something while it lasts.

We've got a few days off work so lets make hay while the sun shines and do some landscaping around the back of the house.

Jim works too much, but he reckons he's just making hay while the sun shines. He says he'll slow down once he's made his fortune.

Persian: از فرصت استفاده کردن