A promise is a debt.
More German Proverbs:
The sun will bring to light what lay under the snow.German
Once is people's mouths, 'tis hard to get well out of them.
German
Age before beauty, said the devil as he threw his grandmother off' the stairs.
German
Young drinkers, old beggars.
German
Forbearance is no acquittance.
German
We do in haste what we repent at leisure.
German