Opportunity only knocks once.
More German Proverbs:
Handsome is as handsome does.German
Where'er an ass is crown'd to fame, both town and country bear the shame.
German
What one does not bake, another brews.
German
Ragged colts make the handsomest stallions.
German
Early to rise and late to bed, lifts again the debtor's head.
German
Don't cry fish before they're caught.
German