«قِل مِ النَّدْرْ وِاوْفِي»

The saying advises anyone making a vow, a solemn pledge that binds once made, to keep it small and then honor it fully. A modest pledge that is actually carried out is presented as far better than a grand one that the person later cannot fulfill.

More broadly, it values reliability over show. Overreaching commitments risk ending in failure and broken obligation, so the wiser course is to promise only what lies within one's means and then follow through completely.

Fits moments when someone is about to make an ambitious vow or solemn pledge, whether a devotional offering or a generous promise, and a listener wants to urge restraint. It works as gentle advice: bind yourself only to what you can certainly deliver.