Measure thrice before you cut once.
More Dutch Proverbs:
The pitcher goes so long to the well that it breaks at last.Dutch
Every flail on the oats.
Dutch
When things are at the worst they begin to mend.
Dutch
On a small pretence the wolf devours the sheep.
Dutch
Hasty speed don't oft succeed.
Dutch
Don't postpone until tomorrow, what you can do today.
Dutch