Yadūnakaṃ taṃ saṇati,
yaṃ pūraṃ santameva taṃ.
rahado pūrova paṇḍito.
Things that are empty make a noise,
the full is always quiet.
The fool is like a half-filled pot,
the wise one is like a deep still pool.
Sutta Nipāta 3.726
Gemstones of the Good Dhamma, compiled and translated by Ven. S. Dhammika