Make not your sail too big for your ballast.
More English Proverbs:
Let every man praise the bridge he goes over.English
Despair doubles our strength.
English
The more acquaintance, the more danger.
English
A rolling stone gathers no moss.
English
You may poke a man's fire after you've known him for seven years.
English
Better wed over the mixen than over the moor.
English