Between promising and performing a man may marry his daughter. 
Proverbs on a similar topic
Related proverbs
Similar proverbs in another language
French
-
Il y a fort loin de la coupe aux lèvres.
It's a long way from the cup to the lips.
-
Qui tout me promet, rien ne me promet.
Who promises me everything, promises me nothing.
-
Autre est promettre, autre est donner.
Other is to promise, other is to give.
Czech
-
Slibem neurazíš.
You won't be offended by a promise.
-
Slibuje hory doly, a nepodal by jednomu vody.
He promises mountains of mines, and he wouldn't give one water.